[EN] A PROCESS FOR INDUSTRIALLY VIABLE PREPARATION OF (S,S,S) PHENYLMETHYL-2-AZABICYCLO-[3.3.0]-OCTANE-3-CARBOXYLATE TOSYLATE<br/>[FR] PROCEDE DE PREPARATION INDUSTRIELLEMENT VIABLE DE (S,S,S) PHENYLMETHYL-2-AZABICYCLO-[3.3.0]-OCTANE-3-CARBOXYLATE TOSYLATE
申请人:BABU POTLURI RAMESH
公开号:WO2005049568A1
公开(公告)日:2005-06-02
A process for industrially viable preparation of a hitherto unreported intermediate viz., [s, s, s] phenylmethyl -2-azabicyclo [3.3.0]-octane-3-carboxylae tosylate by reacting methyl-N-acetyl- R-chloro alaninate of formula-II with 1-(1-pyrrolidinyl)-cyclopentene of formula (III) in an aprotic solvent using an organic base at 0-50°C and hydrolyzing and cyclizing the compound of formula (IV) and hydrogenating the compound of formula (V) to give a product of formula (VI) viz., 2-azabicyclo [3.3.0] octane 3-carboxylic acid tosylate. Esterifying the product of formula (VI) to give racemic phenylmethyl 2-azabicyclo [3.3.0] octane-3-carboxylate tosylate of formula (VII). Resolving the amino acid ester with an optically active acid, separating the diastereomeric salt, breaking it and converting it to a salt of formula (I).
一种工业上可行的制备方法,用于制备迄今为止未报告的中间体[s,s,s]苯甲基-2-氮杂双环[3.3.0]辛烷-3-羧酸甲磺酸酯,通过在无极溶剂中,使用有机碱,在0-50°C下将式II的甲基-N-乙酰-R-氯丙氨酸与式III的1-(1-吡咯烷基)-环戊烯反应,然后水解和环化式IV的化合物,并加氢式V的化合物,得到式VI的产物,即2-氮杂双环[3.3.0]辛烷-3-羧酸甲磺酸酯。酯化式VI的产物,得到式VII的外消旋苯甲基-2-氮杂双环[3.3.0]辛烷-3-羧酸酯甲磺酸盐。用手性酸分离氨基酸酯,分离对映异构体盐,将其分解并转化为式I的盐。