Benzo-Annulated Steroids: Synthesis of Octahydro-indeno-phenanthrenes by Formal [3+3] Cyclocondensation Reaction with 1,3-Bis[(trimethylsilyl)oxy]buta-1,3-dienes
Abstract
Octahydro-indeno-phenanthrenes, benzo-annulated steroids, were prepared by formal [3+3] cyclocondensation reaction of 1,3-bis[(trimethylsilyl)oxy]buta-1,3-dienes with the silyl enol ether of 16-formylestrone methyl ether.