4-[(8R,9S,13S,14S,16R)-17-(tert-Butyl-dimethyl-silanyloxy)-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-16-yl]-butyric acid methyl ester 在
6-iodohexanol, tetrahydropyranyl ether 、
lithium diisopropyl amide 作用下,
生成
2-{2-[(8R,9S,13S,14S,16R,17S)-17-(tert-Butyl-dimethyl-silanyloxy)-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-16-yl]-ethyl}-8-(tetrahydro-pyran-2-yloxy)-octanoic acid methyl ester 、 methyl 2-[2-[(8R,9S,13S,14S,16R,17S)-17-[tert-butyl(dimethyl)silyl]oxy-3-methoxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-16-yl]ethyl]-8-(oxan-2-yloxy)-2-[6-(oxan-2-yloxy)hexyl]octanoate 、 Methyl 6-(3'-methoxy-17'β-tert-butyldimethylsilyloxyestra-1',3',5'(10')-trien-16'α-yl)-2-[2''-(3'''-methoxy-17'''β-tert-butyldimethylsilyloxyestra-1''',3''',5'''(10''')-trien-16'''α-yl)ethyl]-3-oxohexanoate