(4a'S,7a'R,12b'S)-7'-(cyclopropylmethyl)-11'-methoxy-6'-oxo-3',4',7',7a',8',12b'-hexahydrospiro[1,3-dioxolane-2,2'-phenanthro[9,8a-d][1,3]oxazole]-12b'(1'H)-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72%的产率得到(4a'S,7a'R,12b'S)-7'-(cyclopropylmethyl)-11'-methoxy-6'-oxo-3',4',6',7',7a',8'-hexahydrospiro[1,3-dioxolane-2,2'-phenanthro[9,8a-d][1,3]oxazole]-12b'(1'H)-carboxylic acid