(6S,9S,12S)-12-benzyloxycarbonylamino-9-isobutyl-8,11-dioxo-2-oxa-7,10-diazabicyclo[12.2.2]octadeca-1(17),14(18),15-triene-6-carboxylic acid methyl ester 在
lithium aluminium tetrahydride 、
甲醇 作用下,
以
四氢呋喃 为溶剂,
以83%的产率得到((6S,9S,12S)-6-hydroxymethyl-9-isobutyl-8,11-dioxo-2-oxa-7,10-diaza-bicyclo[12.2.2]octadeca-1(17),14(18),15-trien-12-yl)-carbamic acid benzyl ester