Optically active fluorine-containing 3-hydroxybutyric acid esters and
申请人:Showa Shell Sekiyu Kabushiki Kaisha
公开号:US05118836A1
公开(公告)日:1992-06-02
An optically active (3R)- or (3S)-fluorine-containing-3-hydroxybutyric acid ester represented by the formula: ##STR1## wherein R represents an alkyl group of C.sub.3 -C.sub.16 and A represents CF.sub.3, CHF.sub.2 or CH.sub.2 F, which is useful for synthesis of optically active substances, is prepared with high optical purity by ester exchange reaction between an alcohol represented by the formula: ROH wherein R is as defined above and optically active (3R)- or (3S)-fluorine-containing-3-hydroxybutyric acid ethyl ester of ##STR2## in the presence of an ammonium salt of sulfonic acid.
3-Aryloxazolidinone derivatives, process for their preparation and their
申请人:Delalande S.A.
公开号:US05036090A1
公开(公告)日:1991-07-30
The derivatives of the formula: ##STR1## wherein: R.sub.1 is H or C.sub.1 -C.sub.4 alkyl; X is an oxygen atom, a methylene group or a --CH.dbd.CH-- group; n is 1 or 2 when X is an oxygen atom or a methylene group and is 0 or 1 when X is a --CH.dbd.CH-- group; R.sub.3 is a C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.7 cycloalkyl, phenyl, benzyl, CHF.sub.2, CF.sub.3 or CF.sub.3 CF.sub.2 group; each of R.sub.2 and R'.sub.2 independently is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.4 -C.sub.7 cycloalkyl, phenyl or benzyl group; R'.sub.2 and R.sub.3 may further form together a --(CH.sub.2).sub.3 -- or --(CH.sub.2).sub.4 -- chain; and each of R.sub.4 and R'.sub.4 independently is a C.sub.1 -C.sub.4 alkyl group or R.sub.4 and R'.sub.4 form together either a --(CH.sub.2).sub.2 -- or --(CH.sub.2).sub.3 -- chain, a --(CH.sub.2).sub.2 -- or --(CH.sub.2).sub.3 -- chain substituted by one or two C.sub.1 -C.sub.4 alkyl groups, or a --(CH.sub.2).sub.2 -- chain substituted by one or two --CH.sub.2 --NH.sub.2 groups or by one or two --CH.sub.2 --NH.sub.2 groups N-substituted by one or two C.sub.1 -C.sub.4 alkyl groups, useful as drugs.
3-aryl oxazolidinone compounds and therapeutic use thereof
申请人:Delalande S.A.
公开号:US05264443A1
公开(公告)日:1993-11-23
Derivatives having the formula: ##STR1## where R.sub.1 denotes C.sub.1 -C.sub.4 alkyl; X denotes oxygen or methylene; R.sub.2 denotes C.sub.1 -C.sub.4 alkyl or CF.sub.3 ; R.sub.3 denotes a CH.sub.2 R.sub.4 group in which R.sub.4 is (i) a pentagonal or hexagonal aromatic heterocyclic group comprising one or two nitrogen atoms and optionally fused with a benzene ring or (ii) a group having the formula ##STR2## where n=0 or 1, and R.sub.5 and R.sub.6 independently denote C.sub.1 -C.sub.4 alkyl or benzyl, and R.sub.5 and R.sub.6 also, together with the nitrogen atom to which they are bonded, form a piperidino or pyrrolidino or morpholino or N-methyl piperazino radical, and their N-oxide forms and acid addition salts of these derivatives and their N-oxide forms, the derivatives being in various stereoisomeric forms or in the form of a mixture of these forms, including the racemic form.