Racemic cis-1-methoxycarbonyl-2-methylcyclobutane uncontaminated with the trans isomer was prepared efficiently in five steps; the corresponding amides from (R)-(-)-phenylglycinol were separated. An X-ray crystallographic structure determination of the amide from (+)-cis-1-methoxycarbonyl-2-methylcyclobutane showed that it was of (1R,2S) absolute stereochemistry, a revision of configurational assignment
分五个步骤有效地制备了未被反式异构体污染的外消旋顺式-1-甲氧基羰基-2-甲基
环丁烷。从(R)-(-)-苯基
甘醇中分离出相应的酰胺。由(+)-顺式-1-甲氧基羰基-2-甲基
环丁烷的酰胺的X射线晶体结构测定表明,它具有(1R,2S)绝对立体
化学,构型分配的修正。