(1S,2R,3S)-2,3-Bis-(tert-butoxycarbonylmethyl-carbamoyl)-1-methoxymethyl-cyclopropanecarboxylic acid ethyl ester 在
lithium hydroxide 作用下,
以
四氢呋喃 为溶剂,
以76%的产率得到[6-(
tert-butoxycarbonylmethyl-carbamoyl)-1-methoxymethyl-2,4-dioxo-3-aza-bicyclo[3.1.0]hex-3-yl]-acetic acid
tert-butyl ester