(5a'R,8a'S,11a'R,11b'S)-6'-(cyclopropylmethyl)-2'-methoxy-5a',6',9',10',11a',11b'-hexahydrospiro[1,3-dioxolane-2,11'-furo[2',3',4',5':4,5]phenanthro[9,8a-d][1,3]oxazol]-7'(5'H)-one 在
水 、
potassium carbonate 作用下,
以
甲醇 为溶剂,
反应 48.0h,
以94%的产率得到(3a'R,9'R,9a'S,9b'S)-9'-{(cyclopropylmethyl)[(2,2,2-trichloroethoxy)carbonyl]amino}-5'-methoxy-1',2',3a',8',9',9b'-hexahydro-9a'H-spiro[1,3-dioxolane-2,3'-phenanthro[4,5-bcd]furan]-9a'-yl acetate