(4-nitrophenyl)methyl (2R,3Z,5R)-3-[2-(oxan-2-yloxy)ethylidene]-7-oxo-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylate 、
甲氧羰基亚甲基三苯基正膦 以
甲苯 为溶剂,
反应 18.0h,
以31%的产率得到p-nitrobenzyl (2R,5R)-(Z)-7-methoxycarbonylmethylene-(Z)-3-<β-(tetrahydrpyran-2'-yl)oxyethylidene>-4-oxa-1-azabicyclo<3.2.0>heptane-2-carboxylate