二碳酸二叔丁酯 、
(3aR,4S,4aR,7aS,8S,8aR)-8-hydroxy-6,6,8-trimethyl-1-oxohexahydro-1H,3H,4H-3a,8a-methanoindeno[5,6-c]furan-4-yl (2R,3S)-3-amino-2-hydroxy-3-phenylpropanoate 以
乙醚 为溶剂,
生成 [(1R,2S,3R,7S,8S,9R)-8-hydroxy-5,5,8-trimethyl-10-oxo-11-oxatetracyclo[7.3.1.01,9.03,7]tridecan-2-yl] (2R,3S)-2-hydroxy-3-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoate