CA1178594A

CA1178594A - Aminomethyl-5 oxazolidinic derivatives, the process for preparing same and the use thereof in therapeutics

Info

Publication number: CA1178594A
Application number: CA000396983A
Authority: CA
Inventors: Margherita Strolin-Benedetti; Michel Langlois; Alain Lacour; Philippe Dostert
Original assignee: Delalande SA
Current assignee: Synthelabo SA
Priority date: 1981-02-25
Filing date: 1982-02-24
Publication date: 1984-11-27
Also published as: AU8075682A; GB8417905D0; GB2094299A; JPH0261465B2; ES509848A0; GB2094299B; GB2141716A; BE892270A; AU553462B2; JPS5838273A; US4476136A; SE8201145L; ES8306707A1; CH653999A5; LU83963A1; NL8200732A; GB2141716B; SE457258B; FR2500450B1; IT8219730A0

Abstract

ABSTRACT OF THE DISCLOSURE

Derivatives corresponding to the general formula :
(I) in which Ar represents a phenyl group ; a phenyl group substituted by a halogen atom or by a trifluoromethyl group ; or the (chloro-3 fluoro-4) phenyl group and n is either equal to zero or equal to 1 in which case X is a chain chosen from the following : -CH2-CH2-, -CH=CH-, -C?C-, -CH2-O- whose CH2 group is linked to Ar.
These compounds are useful as medicaments more especially for the treatment of troubles of the central nervous system and senescence.

Description

~J l Title : "Novel aminomethyl-5 oxazolidinic derivatives, the process for preparing same and the use thereof in therapeutics"
(Invention of Philippe DOSTERT, Alain LACOUR, Michel LANGLOIS, Margherita STROLIN-BENEDETTI) Applicant : DELALANDE S.A.

ABSTRACT OF THE DISCLOSURE
_ _ _______ ______ Derivatives corresponding to the general formula :
~ N~-- R
Ar- (X) ~ ~0 (I) in which Ar represeDts a phenyl group ; a phenyl group substituted by a halogen atom or by a trifluoromethyl group ; or the (chloro 3 fluoro-4) phenyl group and n is either equal to zero or equal to 1 in which case X is a chain chosen from the followir~ : -CH2-CH2-, -CH=CH-, -C C-, -CH2-O- whoqe CH2 group i~
linked to Ar.
These compounds are useful as medicaments more especially for the treatment of troubles of the central nervous system and senescence.

ll~X594 The present invention relates to new derivatives of phenyl-3 oxazoli-dinone-2 substituted in position -5 by an aminomethyl group, the process for preparing same and the application thereof in therapeutics.
These new derivatives correspond more precisely to the general formula :

Ar-(X)~

in which :
- R represents either a hydrogen atom, or a linear or branched alkyl group comprising from 1 to 4 carbon atoms or a propargyl group, - Ar represents a phenyl group , a phenyl group substituted by a halogen atom or by a trifluoromethyl group ; or the (chloro-3 fluoro-4) phenyl group ; and - n is either equal to zero, or equal to 1 in which case X is a chain chosen from the followine : -CH2-CH2-, -CH=CH-, -C~-, -CH2-0- the CH2 group of which is lirked to Ar ;
the pair (Ar, R) not however being able to assume the following values (C6H5, H?~ (C6H5, CH3), (m-Cl-C6H4, H), (m-Cl-C6H4, CH3), (p-F-C6~ H) (p-F-C6H4, CH3) when Ar-(X)n represents the Ar-CH2-0- chain.
The present invention also relates to the acid addition salts of ths compounds of formula (I), these acids being able to be mineral such as hydro-chloric acid or organic such as mesylic acid.
The process for preparing the compounds of formula (I) consists in :
- condensing the amines of formula :
R~ - NH2 (II) in which R' represents a linear or branched alkyl group comprising 1 to 4 carbon atoms or the propargyl group, with the tosylate or mesylate of formula :

Ar-(X)n ~ ~ S2-Rl (III) in which Ar, X and n have the same meanings as in formula (I) and R1 repre-sents the methyl group or the p-tolyl group, this condensation being prefe-rably carried out in an autoclave at 120 C and in an alcohol medium such as methanol or ethanol, which leads to the compounds of formula (I) in which 1~ 7~5~4 _ 2 -R represents a linear or branched alkyl group comprising from 1 to 4 carbon atoms or the propargyl group ; and in - condensing potassium phthalamide, at reflux preferably in toluene, in the presence of a so-called "phase transfer" catalyst such as hexadecyltributyl phosphonium bromide for example, on the compounds of formula (III), then in treating the intermediate compounds thus obtained of formula :
. O

Ar-(~) ~ ~ ~ ~ (I~) in which Ar, n and X have the same meanings as in formula (I) with hydrazine hydrate at reflux in an alcohol solvent such as ethanol for example, which leads to the compounds of formula (I) in which R = H.
The compounds of formula (III) are obtained by action of mesyl or tosyl chloride, preferably in a methylene chloride medium and in the presence of a basic agent such as triethylamine, on the compounds of formula :

Ar-(X)n ~ ~ OH ~V~

in which Ar, n and X have the same meanings as in formula (I).
The novel compounds of formula (V), namely those in which n = O and those in which n = 1 and X represents the -CH=CH- and -CH2-CH2- chains, are Z5 obtained from the anilines of formula :

Ar - (X)n ~ NH2 (~I) in which Ar has the same meanings as in formula (I) and n is equal to zero or is e~ual to 1 in which case X' represents the -CH=CH- or -CH2-CH2- chain, by a two step synthesis which consists in treating these formula (VI) compounds wiSh glycidol then in cyclizing the intermediate amino-diols obtained with ethyl carbonate.
Certain formula (VI) compounds are new. Thus, those in which n = 1, X' represents the -CH2-CH2- chain and Ar represents the meta-chlorophenyl, para-chlorophenyl, meta-fluorophenyl, meta-trifluoromethylphenyl and meta-chloro para-fluorophenyl groups are obtained by catalytic reduction, for example in 117~5 the presence of palladium on charcoal (5 or 10 % of palladium) and hydrochloric acid and in an alcohol medium, of the compounds of formula :
Ar' - CH = CH g No2 (VII) in which Ar' ha~ the meanings just mentioned above.
The compounds of formula (VII) are obtained by condensation of para-nitrophenylacetic acid, in the presence of piperidine, with the aldehydes of formula :
Ar' - CHO (~III) in which Ar' has the same meanings as informula (VII).
Furthermore, the novel compounds of formula (V) in which r. = 1 and X
represents the -C3C- chain are obtained by condensation of the compounds of formula :
Ar - C - C - Cu (IX) in which Ar has the same meanings as in formula (I), with the compound of formula :

I ~ ~ 0~ (X) this condensation taking place preferably in hexamethylenephosphotriamide (H.M.P.T.) at a temperature of 160 C.
The compounds of formula (IX) are prepared according to the method described in Angew. Chem. Int. Edit. 9, 464, (1970), and the compound of for~.ula (X) is prepared by condensation of para-iodoaniline with glycidol, then cyclization of the intermediate compound obtained with ethyl carbonate.
The following preparations are given by way of examples for illus-tratir.g the invention.
3 x3mple 1 : N-methylaminomethyl-5 para-(meta-chlorophenetyl) phenyl-3 oxazolidinone-2, hydrochloride (I) Code number : 7 4.1 g of mesyloxymethyl-5 para-(meta-chlorophenetyl) phenyl-3 oxazo-lidinone-2 (III) in a methylamine saturated methanol solution is heated to 120 C, for 90 minutes, in an autoclave. Then it is thrown in a mixture of ice, water and NaOH, extracted with chloroform, washed with water, dried on 5'34 ` - 4 ~
sodium sulfate, filtered, the fil~rate is evaporated, the residue dissolved in ethanol, hydrochloric ethanol is added and the precipitate is separated by filtration and washed with ether.
By the same process, but from the corresponding reagents, the compounds of formula (I) were obtained, shown in table I below under code numbers : 9, 12 and 14 to 19.
Example 2 : aminometl1yl-5 para-(meta-chlorophenetyl) phenyl-3 oxazolidinone-2 (I) ode number : 6 1st step : para-(meta-chlorophenetyl) phenyl-3 (phthalimidyl-2) methyl-5 oxazolidinone-2 (IV) Code number : 52 _~_ ._.
A mixture of 9.2 g of mesyloxymethyl-5 para-(meta-chlorophenetyl) phenyl-3 oxazolidinone-2 (III), 5 g of potassium phthalimide and 1.1 g of hexadecyltributylphosphonium bromide in 110 ml of toluene is brought to reflux for 24 hcurs. Then the solYent i9 evaporated, the residue taken up in water and chloroform, the obtained solution is decanted, the organic phase is dried on sodium sulfate, filtered, the solvent is evaporated and the residue crys-tall-zed in petroleum ether. 98 % of the expected product is obtained which

2~ has a melting point of t70 C.
By the same process, but from the corresponding reagents, the compounds of formula (IV) are obtained which are required for the synthesis of the compounds of formula (I), and particularly those shown in table II
below under code numbers 22 to 32.
2nd step : aminomethyl-5 para-(meta-chlorophenetyl) phenyl-3 ________ oxazolidinone-2 (I) Code number : 6 ___ ___ _ _ A suspension of 10.1 ~ of the compound of formula (IV) obtained in the preceding step and 2 7 g of hydrazine hydrate in 280 ml of alcohol is brought to reflux for 2 hours. Then it is filtered, the filtrate evaporated, the residue is taken up in chloroform, the obtained solution is washed with water, dried with sodium sulfate, filtered, the filtrate is evaporated and the residue is crystallized in petroleum ether.
By the same process, bu~ from the corresponding reagents, the compounds of formula (I) are obtained which are shown in table I under code numbers : 1 to 5, 8, 10, 11, 13, 20 and 21.

5~

Example 3 : hydroxymethyl-5 para-(para-fluorophenetyl) phenyl-3 oxazolidinone-2 (V) __ Code number : 33 A solution of 34 g of para-fluorophenetyl-4 aniline (VI, and 11.7 g of glycidol in 150 ~l of ethanol are left in contactat room temperature for 24 hours. Then the solvent is evaporated and the residue chromatographed on a silica column. After elution with the chloroform (97.5 %)/methanol (2.5 %) mixture, 26 g (Yield ~ 57 %) of the expected product are obtained which are dissolved in 300 ml of toluene. 8 g of ethyl carbonate and a few drops of a 5 % solution of sodium methylate in methanol are added. The mixture is then brought to reflux, while distilling the alcohol formed. Then the toluene solution is concentrated, cooled and the precipitate formed is filtered, washed with ether on the ~ilter and recrystallized in isopropylic alcohol. Thus 13 g of the expected product are obtained.
By the same process, but from the corresponding reagents, the compounds of formula (V) are obtained [which are required for the synthesis of the compounds of formula (I)] shown in table III under code numbers 34 to 39.
xample 4 : mesyloxymethyl-5 para-(para-fluorophenetyl) phenyl-3 oxazolidinone-2 (III) _de number : 41 A solution of 12.7 g of the compound of formula (V), code number 33, obtained in the preceding example, 9.1 g of mesyl chloride and 8 g of methyla-mine in 300 ~l of methylene chloride is left at room temperature for 24 hours.
Then it is washed with water, dried on sodium sulfate, filtered, the filtrate is evaporated and the residue crystallized in petroleum ether.
By the same proces.s, the compounds of formula (III) are obtained which are required for the synthesis of the compounds of formula (I) and appear in tzble IV under code numbers 40 and 42 to 51.
Example 5 : meta-trifluoromethylphenetyl-4 aniline tVI)

3 C e number : 53 1st step : nitro-4 trifluoromethyl-3' stilbene (VII) A mixture of 72.4 g of paranitrophenylacetic acid and 69.6 g of meta-trifluoromethylbenzaldehyde is heated to 70 C. Then 34 g of piperidine are slowly added and the solution is brought to 110~ C for 90 minutes. Then it is thrown in 250 ml of ethanol, the precipitate obtained is filtered and rinced with alcohol. 22 % of the expected product is obtained which is yellow and whose melting point is 120 C.

1 1'7~35~ 1 2nd step : meta-trifluoromethylphenetyl-4 aniline (VI) ________ A suspension of 26 g of the compound of formula (VII) obtained in the preceding step and 2.6 g of palladium on charcoal (5 % of palladium) in 400 ml of ethanol and 100 ml of T.H.F. is brought to 30 C, at a pressure of 3 kg of hydrogen, in an autoclave. Then it is filtered and the filtrate evapo-rated. 94 % of an oil is obtained which is used for preparing the corresponding compound of formula (V), according to the method described in example 3.
. NMR~spe trum : (CDC13) ~ppm = 7.35, m, 4 aromatic protons ; 6.90, d, (J = 7 Hz) and 6.45, d, (J = 7 Hz), 4 aromatic protons ; 3.40, s, 2 NH2 protons;
2.80, s, 4 -CH2-CH2- protons.
By the same process, but from the corresponding reagents, the compounds of formula (VI) are obtained which are required for the synthesis of tha compounds of formula (I) and more especially the following :
. 4-(para-fluorophenetyl) aniline ~code number 54, melting point 93 C]
. 4-(meta-fluorophenetyl) aniline [code number 55, melting point 54~ C]
. 4-(para-chlorophenetyl) aniline [code number 56, melting point 90 C]
. 4-(meta-chloro para-fluorophenetyl) aniline [code number 57, melting point 73 C] 0 Examp_e 6 : para [(meta-chlorophenyl)-1 ethynyl-2] phenyl-3 hydroxymethyl-5 oxazolidinone-2 (V3 Code number : 58 .
A suspensicn of 10.8 g of the copper salt of meta-chlorophenyl-1 ethynyl (IX) and 14.7 g of para-iodophenyl-3 hydroxymethyl-5 oxazolidinone-2 (X) in 230 ml of H.M.P.T. is brought to 160 C until complete dissolution is obtained. Then it i3 allowed to cool to room temperature, thrown in water, the obtained mixture is extracted with ethyl acetate, the extract is washed with water, dried on sodium sulfate, filtered, the filtrate is evaporated and the residue crystallized in a mixture of 150 ml of isopropylic ether and 20 ml of ether. 11.5 g o~ the expected product are obtained.
. Yield : 76 %
Melting point : 96C.

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. 23 F- ~ CH2-CH2- . C26H21FN204 444~44 217 .' . .. _ _ __.......... . ,.. _ ........
24 ~ CH -CH - C~6H21F N204~44~44 184 - . . . . . .- . . .
C~- ~ CH2-CH2- C26H21ClN204460.90 244 -- CF --- Cz~ / 478.89 196 27 ¦ ~ CH2-C112 . C27H21F3N204494O45 165 .

28 ICl ~ ¦ C24 17 2 4432,85 ZCO

H Q ¦ C26H1gClN2~4458,88 220- .

! ~ ¦ C26H1 7ClN204 b56,87 188 .

31 1 3 ~ C`d2-0- ~ C26H19F3N25528~49 164 .
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35Cl~CH2CH2-- C 1 8E~ I 8ClN3 331~ 7 9 131 . 36 ~3 2 2 _ 33$~77 120 . r ~ -- _ . . _ _ . .
37 ~CH2 2 19 18 3 2 349~,34 ` 120 .. C1 i _ ' . ._ 38 ~ C I 8H I 6ClN3 . 329~ 7 7 96 _ _ _ _ ___ . 39 Cl~ C 16~1 4ClN03 303~ 74 170 1 ~'7~
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2 ¦CI93I3F3N~65 ¦ 445,4l ¦ 128 51 F- ~ C~2-0- C18HI7ClFNO6S 429,85 I22 .

5~

The compounds of formula (I) and their phar-maceutically acceptable acid addition salts were tested on laboratory animals and revealed to be able to inhibit the monoamine oxydase, particularly the type B monoamine oxydase.
This activity was demonstrated ex vivo on rats to which a single dose of the compounds of formula (I) or their salts in suspension at 5% in methylcellulose was administered orally. Then the rats were sacrificed by decapitating them at different times (30 minutes, 1 hour, 2 hours, 4 hours, 8 hours, 24 hours after administration).
The brains were removed, weighed and homogenized and deter-mination of the IMAO activity is effected by using seroto-nine (a specific substrate of MAO of type A) and phenylethylamine (a specific substrate of MAO of type B) according to the method described by J.P. KAN and M.
STROLIN-BENEDETTI in Life Sciences 26, 2165, (1980).
To illustrate the invention, chere is given in table V below the results obtained in this test for some compounds of the invention [the maximum effect is that observed between 30 minutes and 8 hours].
Acute toxicity in mice, under oral administra-tion, was measured according to the method of MILLER and TAINTER described in Proc. Soc. Exp. Biol. Med. 57, 261, (1944).

l:i 7~59 4 -16a-TABLE V

_ _ IMAO Effect Compound Acute toxicity _ _ _ _ tested in mice Dose ad- IMAO-A effect IMAO-B effect LD 50(mg/Kg/p.o.) ministered (mg/Kg/p.o.) Max. 8h 24h Max. 8h 24h _ _ _ _ 4 ? 2.000 5 16 1 0 56 46 53

6 .. 5 3011 0 91 90 79 ~.5 11 3 4 64 64 57 8 .. 5 2418 2 82 81 51 ll 5 1918 3 87 87 81 12 ~. 5 1919 13 87 74 85 16 ,. ~ 1712 6 73 66 52 19 .. 5 1714 0 87 87 75 _ _ ~ 7~sg~ 1 The difference between toxic doses and active doses shows that the compounds of the invention can be usedin ~herapeutics. They will be used for (a) troubles of the central nervous system treated by inhibitors of the B type monoamine oxydase, particularly in association with L-DOPA in the treatment of PARKINSON's disease [see, for exemple, Isr. J. Med. Sci. 15, 617 (1979) ;
Adv. in Biochem. Psychopharm. 19, 377 ; Brit. J. Chem. Pharmacol. 9, 98, (1980] and (b) for senescence troubles.
The invention extends to pharmaceutical compositions including, as active ingredient, one at least of the compounds of the invention in associa-tion with a pharmaceutically acceptable vehicle.
They will be administered either orally,in the form of tablet~, pills or capsules, at a posology up to 500 mg/day of active ingredient, or parenterally, in the form of an aqueous injectable solution at a posology up to 50 ~/day of active ingredient.

Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A process for preparing an aminomethyl-5 aryl-3 oxazolidinone-2 of the general formula:

(I) in which:
- R is hydrogen, a linear or branched alkyl group having 1 to 4 carbon atoms or a propargyl group, - Ar is phenyl; phenyl substituted by a halogen atom or by a trifluoromethyl group; or (chloro-3 fluoro-4) phenyl;
and - n is zero, or 1, X in the latter case being selected from -CH2-CH2, -CH=CH-, -C?C-, -CH2-O- the CH2 group of which is linked to Ar; provided that the pair (Ar, R) can not be (C6H5, H), (C6H5, CH3), (m-Cl-C6H5, H), (m-Cl-C6H4, CH3), (p-F-C6H5, H), (p-F-C6H4, CH3) when Ar-(x)n repre-sents the Ar-CH2-O- chain;
and its pharmaceutically acceptable salts, the process being selected from:
(a) when R is hydrogen, treating with hydrazine hydrate a compound of formula:

(IV) in which Ar and (X)n have the same meanings as in formula (I);
(b) when R is an alkyl group of 1 to 4 carbon atoms or a propargyl group, condensing a compound of formula:

(III) in which Ar, X and n have the same meanings as in formula (I) and R1 is methyl or p-tosyl, with an amine of formula:

R' - NH2 (II) in which R' is an alkyl group of 1 to 4 carbon atoms or a propargyl group;
and, if required, converting the product into a phar-maceutically acceptable salt.

2. A process as claimed in claim 1, in which n = 0 or n = 1 and X is any one of the chains -C?C-, -CH=CH- and -CH2-CH2-, R is hydrogen or an alkyl group of 1 to 4 carbon atoms and Ar is phenyl, phenyl substituted by halogen or by trifluoromethyl or the (chloro-3 fluoro-4 phenyl group.

3. A process as claimed in claim 2, in which the pair (Ar-(X)n, R) is selected from: (p-C1-C6H4, H), (C6H5-CH2-CH2, H), (p-F-C6H4-CH2-CH2, H), (m-F-C6H4-CH2-CH2, H), (p-C1-C6H4-CH2-CH2, H), (m-C1-C6H4-CH2-CH2, H), (m-C1-CH6H4-CH2-CH2, CH3), (m-C1 p-F-C6H3-CH2-CH2, H), (m-C1 p-F-C6H3-CH2-CH2, CH3), (m-CF3-C6H4-CH2-CH2, H), (m-C1-C6H4-CH=CH, H), (m-C1-C6H4-CH=CH, CH3), (m-C1-C6H4-C?C, H), (m-C1-C6H4-C?C, CH3).

4. A process claimed in claim 1, in which the Ar-(X)n chain has the structure Ar-CH2-0- and R is either hydrogen, or an alkyl group of 1 to 4 carbon atoms, pro-vided the pair (Ar, R) can not be: (C6H5, H), (C6H5, CH3), (m-C1-C6H4, H), (m-C1-C6H4, CH3), (p-F-C6H4, H), (p-F-C6H4, CH3).

5. A process as claimed in claim 4, in which the pair (Ar, R) is selected from: (m-C1-C6H4, Et), (m-C1-C6H4, C3H7n), (m-C1-C6H4, C3H7iso), (m-C1-C6H4 C4H9n), (m-C1-C6H4, CH2-C?CH), (m-CF3-C6H4, H), (m-C1 p-F-C6H3, H).

6. A process as claimed in claim 1 in which, in process (a), the compound of formula (IV) is obtained by treating a compound of formula (III) as defined in process (b) with potassium phthalimide in the presence of a phase transfer catalyst.

7. A process as claimed in claim 1, in which, in process (b), the compound of formula (III) is obtained by treating a compound of formula:

(V) in which Ar, n and X are as in formula (I) with mesyl or tosyl chloride in the presence of a base.

8. A process for preparing aminomethyl-5p-[(m-chlorophenyl)-1 ethynyl-2] phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts that comprises reacting hydrazine hydrate with p-[(m-chlorophenyl)-ethynyl-2] phenyl-3(phthalimidinyl-2) methyl-5 oxazolidinone-2 and, if required, converting the product into a pharmaceutically acceptable salt.

9. A process for preparing N-methylaminomethyl-5p-[(m-chlorophenyl)-1 ethynyl-2] phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts that comprises reacting methylamine with mesyl- or tosyloxymethyl-5p-[(m-chlorophenyl)-1 ethynyl-2] phenyl-3 oxazolidinone-2 and, if required, converting the product into a pharmaceutically acceptable salt.

10. A process for preparing aminomethyl-5p(m chlorophenethyl) phenyl-3 oxazolidinone-2 and its phar-maceutically acceptable salts that comprises reacting hydrazine hydrate with p(m-chlorophenethy:l)phenyl-3 (phthalimidinyl-2) methyl-5 oxazolidinone-2 and, if required, converting the product into a pharmaceutically acceptable salt.

11. A process for preparing aminomethyl-5 p(m-trifluoromethylphenethyl) phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts that comprises reacting hydrazine hydrate with p(m-trifluoromethylphene-thyl)phenyl-3 (phthalimidinyl-2) methyl-5 oxazolidinone-2 and, if required, converting the product into a phar-maceutically acceptable salt.

12. A process for preparing N-ethylaminomethyl -5p(m-chlorobenzyloxy) phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts that comprises reacting ethylamine with mesyl- or tosyloxy-5p(m-chlorobenzyloxy) phenyl-3 oxazolidinone-2 and, if required, converting the product into a pharmaceutically acceptable salt.

13. A process for preparing N-n-propyl-aminomethyl-5p(m-chlorobenzyloxy) phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts that comprises reacting n-propylamine with mesyl- or tosyloxy-5p(m-chlorobenzyloxy) phenyl-3 oxazolidinone-2 and, if required, converting the product into a pharmaceutically acceptable salt.

14. A process for preparing N-(propynyl-2) aminomethyl-5p(m-chlorobenzyloxy) phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts that comprises reacting propargylamine with mesyl- or tosyloxy-5p(m-chlorobenzyloxy) phenyl-3 oxazolidinone-2 and, if required, converting the product into a pharmaceutically acceptable salt.

15. A process for preparing aminomethyl-5p (m-trifluoromethylbenzyloxy) phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts that comprises reacting hydrazine hydrate with p(m-trifluoromethylben-zyloxy)phenyl-3(phthalimidinyl-2) methyl-5 oxazolidinone-2 and, if required, converting the product into a phar-maceutically acceptable salt.

16. A process for preparing aminomethyl 5-p(m-chlorostyryl) phenyl-3 oxazolidinone-2 and its phar-maceutically acceptable salts that comprises reacting hydrazine hydrate with p(m-chlorostyryl)phenyl-3(phtha-limidinyl-2) methyl-5 oxazolidinone-2 and, if required, converting the product into a pharmaceutically acceptable salt.

17. A compound having the general formula 1 as defined in claim 1 and its pharmaceutically acceptable salts when produced by a process as defined in claim 1 or by its obvious chemical equivalent.

18. Aminomethyl-5p-[(m-chlorophenyl)-1 ethynyl-2] phenyl-3 oxazolidinone-2 and its pharmaceutically accep-table salts when produced by the process defined in claim 8 or by its obvious chemical equivalent.

19. N-methylzminomethyl-5p-[(m-chlorophenyl)-1 ethynyl-2] phenyl-3 oxazolidinone-2 and its phar-maceutically acceptable salts when produced by the process defined in claim 9 or by its obvious chemical equivalent.

20. Aminomethyl-5p(m-chlorophenethyl) phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts when produced by the process defined in claim 10 or by its obvious chemical equivalent.

21. Aminomethyl-5p(m-trifluoromethyl phenethyl) phenyl-3 oxazolidinone-2 and its pharmaceutically accep-table salts when produced by the process defined in claim 11 or by its obvious chemical equivalent.

22. N-ethylaninomethyl-5p(m-chlorobenzyloxy) phenyl-3 oxazolidinone-2 and its pharmaceutically accep-table salts when produced by the process defined in claim 12 or by its obvious chemical equivalent.

23. N-n-propylaminomethyl-5p(m-chloro benzyloxy) phenyl-3 oxazolidinone-2 and its phar-maceutically acceptable salts when produced by the process defined in claim 13 or by its obvious chemical equivalent.

24. N-(propynyl-2)aminomethyl-5p (m-chloro-benzyloxy) phenyl-3 oxazolidinone-2 and its phar-maceutically acceptable salts when produced by the process defined in claim 14 or by its obvious chemical equivalent.

25. Aminomethyl-5p(m-trifluoromethyl benzyloxy) phenyl-3 oxazolidinone-2 and its pharmaceutically accep-table salts when produced by the process defined in claim 15 or by its obvious chemical equivalent.

26. Aminomethyl 5-p(m-chlorostyryl) phenyl-3 oxazolidinone-2 and its pharmaceutically acceptable salts when produced by the process defined in claim 16 or by its obvious chemical equivalent.