Enantiomers of 1-[(4-chlorophenyl)phenylmethyl]-4-[(4-methylphenyl)
申请人:U C B, S.A.
公开号:US05478941A1
公开(公告)日:1995-12-26
Levorotatory and dextrorotatory enantiomers of 1-[(4-chlorophenyl)phenylmethyl]-4-[(4-methylphenyl)sulfonyl]piperazine of the formula ##STR1## their preparation and use for the preparation of substantially optically pure enantiomers of 1-[(4-chlorophenyl)phenylmethyl]piperazine, which are themselves valuable intermediate products for the preparation of optically active therapeutic compounds having a very high degree of optical purity.
The invention provides a process for the preparation of esters [2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]acetic acid, of the formula (I) ##STR1## wherein X represents a halogen atom and R represents a lower alkyl group comprising reacting: (a) a compound of the formula (II) ##STR2## (b) a compound of the formula (III) ##STR3## and (c) a tertiary amine as a solvent and as an acid scavenger at a temperature of at least 100.degree. C., wherein X is a halogen atom, X' is selected from the group consisting of bromine and chlorine and R is a lower alkyl group.
Enantjomers of 1-[(4-chlorophenyl)phenylmethyl]-4-[(4-methylphenyl) sulfonyl] piperazine
申请人:Cossement Eric
公开号:US20070142400A1
公开(公告)日:2007-06-21
The invention provides a method for the treatment of allergic conditions by administering to a patient an effective amount of dextrorotatory dihydrochloride of 2-[2-[4-[(4-chloro-phenyl)phenylmethyl]-1-piperazinyl]ethoxy]acetic acid. The treatment is conducted in the absence of levorotatory dihydrochloride of 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy]acetic acid.
Enantiomers of 1-[(4-chlorophenyl) phenylmethyl)-4-[(4-methylphenyl)sulfonyl] piperazine
申请人:Cossement Eric
公开号:US20060229319A1
公开(公告)日:2006-10-12
A method is disclosed for the treatment of an allergic condition associated with a cutaneous reaction induced by histamine. There is administered to a patient in need of such treatment the levorotatory dihydrochloride of 2-[2-[4-[(4-chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy] acetic acid.
Enantiomers of 1-[(4-chlorophenyl)phenylmethyl)-4-[(4-methylphenyl)sulfonyl) piperazine
申请人:——
公开号:US20040122021A1
公开(公告)日:2004-06-24
Levorotatory and dextrorotatory enantiomers of 1-[(4-chlorophenyl)phenylmethyl]-4-[(4-methylphenyl)sulfonyl]piperazine of the formula
1
their preparation and use for the preparation of substantially optically pure enantiomers of 1-[(4-chlorophenyl)phenylmethyl]piperazine, which are themselves valuable intermediate products for the preparation of optically active therapeutic compounds having a very high degree of optical purity.