[(1S,5S,6S,9S,10S,11S,13R,16S)-9,16-diacetyloxy-5-hydroxy-6,10-dimethyl-14-oxatetracyclo[8.6.0.03,7.013,16]hexadeca-2,7-dien-11-yl] acetate 、
(3R,4S)-3-(1-乙氧乙氧基)-2-氧-4-苯基-吖丁啶羧酸叔丁基酯 在
sodium hexamethyldisilazane 、
盐酸 、
水 作用下,
以
四氢呋喃 为溶剂,
以40%的产率得到[(1S,5S,6S,9S,10S,11S,13R,16S)-9,11,16-triacetyloxy-6,10-dimethyl-14-oxatetracyclo[8.6.0.03,7.013,16]hexadeca-2,7-dien-5-yl] (2R,3S)-2-hydroxy-3-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoate