One Step Synthesis of Optically Active Diazabicyclo[3.3.0]octanones or Diazabicyclo[4.3.0]nonanones by Asymmetric Conjugate Addition of Cyclic Hydrazine
作者:Chigusa Seki、Haruo Matsuyama、Masafumi Hirama、Takeshi Sato、Saya Takeda、Yoshihito Kohari、Kazuhiro Ishigaki、Masafumi Ohuchi、Kiyoshi Yokoi、Hiroto Nakano、Koji Uwai、Nobuhiro Takano、Kazuyuki Umemura
DOI:10.3987/com-12-12442
日期:——
Asymmetric conjugate addition-cyclization of lithium amide of 6-membered hydrazine 4, piperidazine, (or 5-membered hydrazine 6, pyrazolidine) to N-(E)-cinnamoyl-(1S)-2,10-camphorsultam (1S)-3 afforded beta-amino acid derivative (5)-1 or (S)-2} for the synthesis of polyamine alkaloids in good yield with good stereoselectivity (up to 86% ee).