10-O-tert-butyl 8-O-ethyl (1R,2R,6S,7S,8R)-4,4-diethyl-3,5-dioxa-10-azatricyclo[5.2.1.02,6]decane-8,10-dicarboxylate 在
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
以80%的产率得到ethyl (3aS,7R,7aR)-2,2-diethyl-7-[(2-methylpropan-2-yl)oxycarbonylamino]-3a,6,7,7a-tetrahydro-1,3-benzodioxole-5-carboxylate