Synthetic studies on the key component of the new generation of quinolonecarboxylic acid, DU-6859. 1. Synthesis of (1R,2S)-2-fluorocyclopropylamine by the use of optical resolution
作者:Osamu Tamura、Masaru Hashimoto、Yuko Kobayashi、Tadashi Katoh、Kazuhiko Nakatani、Masahiro Kamada、Isao Hayakawa、Toshifumi Akiba、Shiro Terashima
DOI:10.1016/s0040-4020(01)89665-4
日期:1994.3
by employing highly cis-selective cyclopropanation of N-benzyl-N-vinylcarbamates with zinc-monofluorocarbenoid, deprotection of the formed N-benzyl-N-(cis-2-fluorocyclopropyl)carbamates, and optical resolution of the resulting dl-cis-2-fluorocyclopropylamine by the use of l-menthyl chloroformate as a resolving agent. The cis-selectivity observed for the key cyclopropanation could be explained by the
通过使用N-苄基-N-乙烯基氨基甲酸酯与锌-单氟乙炔化合物进行高度顺式选择性环丙烷化,形成的N-苄基-N-(顺式-2-氟环丙基)氨基甲酸酯脱保护以及所得产物的光学拆分,可以实现标题合成。 dl-顺式-2-氟环丙胺通过使用氯甲酸l-薄荷基酯作为拆分剂。关键的环丙烷化反应观察到的顺式选择性可以通过弯曲的过渡态模型来解释。