2-[3-(tert-butyldimethylsilyloxy)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl]-propionaldehyde 在
sodium hypochlorite 2,2,6,6-tetramethyl-piperidine-N-oxyl 、
sodium chlorite 作用下,
以
乙腈 为溶剂,
以79%的产率得到(2S)-2-[(8S,9S,13S,14S,17R)-3-[tert-butyl(dimethyl)silyl]oxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl]propanoic acid