(5a'R,8a'S,11a'R,11b'R)-6'-(cyclopropylmethyl)-2'-methoxy-7'-oxo-5',5a',6',9',10'-hexahydrospiro[1,3-dioxolane-2,11'-furo[2',3',4',5':4,5]phenanthro[9,8a-d][1,3]oxazole]-11b'(11a')-carbaldehyde 在
sodium chlorite 、
2-甲基-2-丁烯 作用下,
以
水 、
叔丁醇 为溶剂,
反应 16.0h,
以84%的产率得到(5a'R,8a'S,11a'R,11b'R)-6'-(cyclopropylmethyl)-2'-methoxy-7'-oxo-5',5a',6',9',10'-hexahydrospiro[1,3-dioxolane-2,11'-furo[2',3',4',5':4,5]phenanthro[9,8a-d][1,3]oxazole]-11b'(11a')-carboxylic acid