tert-butyl (1S,3R,5S,6S,7S)-3-(tert-butyl)-7-chloro-6-hydroxy-7-(2-benzyloxy)ethyl-2-oxa-4-azabicyclo[3.2.0]heptane-4-carboxylate 、
溴甲苯 在
potassium hydride 作用下,
以
四氢呋喃 、 mineral oil 为溶剂,
以83%的产率得到tert-butyl (1S,3R,5S,6S,7S)-3-(tert-butyl)-7-chloro-6-benzyloxy-7-(2-benzyloxy)ethyl-2-oxa-4-azabicyclo[3.2.0]heptane-4-carboxylate