摘要:
PROBLEM TO BE SOLVED: To provide a new method for preparation of optically active intermediates which may be used for the preparation of escitalopram. SOLUTION: There is provided a method for isolation and purification of S-enantiomer of the diol represented by formula (II), and its acylated derivative. The method includes treating the mixture of the S-enantiomer of the diol and its acylated derivative in the mixture of an organic solvent and water in the presence of an acid, and then performing liquid-liquid separation. In the formula, R is cyano group or the like; the dotted line represents a double or single bond; Hal is halogen; and Z is dimethylamino or the like. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a method for dividing 4-[4-(dimethylamino)-1-(4'-fluorophenyl)-1-hydroxybutyl]-3-(hydroxymethyl)-benzonitrile to its isolated enantiomers. SOLUTION: This method for dividing escitalopram is provided by making the 4-[4-(dimethylamino)-1-(4'-fluorophenyl)-1-hydroxybutyl]-3-(hydroxymethyl)-benzonitrile which is a racemic mixture or a non-racemic enantiomer mixture, as the salts of (+)-(S,S)- or (-)-(R,R)-enantiomer of O,O'-di-p-toluoyl-tartaric acid, and dividing to its enantiomers by fractionally crystallizing the salts in a solvent system containing 1-propanol, ethanol or acetonitrile. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a process capable of carrying out a dehydration at a comparatively low temperature and producing a product of the dehydration free from discoloring in a process producing citalopram comprising dehydration of an oxime compound. SOLUTION: The invention relates to the process for producing the citalopram comprising a step in which a compound represented by formula (I) is dehydrated by using oxalyl chloride preferably in a mixed solvent composed of aromatic hydrocarbons and aprotic polar solvents to obtain a compound represented by formula (II), and a step in which the compound represented by formula (II) is reacted with a 3-dimethylaminopropyl halide. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide a safe and easy method for producing a 5-phthalancarbonitrile compound applying little load on the environment and provide an intermediate and its production method. SOLUTION: A 5-phthalancarbonitrile compound useful as an intermediate for citalopram is produced by using a new compound expressed by formula [II] as a key intermediate. In the formula, X 1 and X 2 are each independently chlorine atom, bromine atom or iodine atom. COPYRIGHT: (C)2006,JPO&NCIPI