(8R,9S,13S,14S,17R)-17-[(3-bromopyridin-2-yl)methyl]-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-17-ol 在
palladium diacetate
R-(+)-1,1'-联萘-2,2'-双二苯膦 作用下,
以79%的产率得到(2R,8'R,9'S,13'S,14'S)-13'-methylspiro[3H-furo[3,2-b]pyridine-2,17'-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene]