Steroid Total Synthesis, Part IV; (�)-13?-ethyl-17?-ethynyl-17?-hydroxy-gon-4-en-3-one
作者:M. Rosenberger、T. P. Fraher、G. Saucy
DOI:10.1002/hlca.19710540852
日期:1971.12.10
AbstractThe title compound (Norgestrel), a potent progestational agent, has been prepared by a new total synthesis. The scheme is based on earlier work with BCD‐tricyclic intermediates, condensation of 2‐ethyl‐cyclopentane‐1,3‐dione with 2‐[2‐diethylamino‐ethyl]‐6‐[4‐t‐butoxy‐pentyl]‐tetrahydropyran‐2‐ol being the key step. The synthesis features the addition of acetylene to a Δ5(10)‐4‐oxa‐17‐keto intermediate, followed by a novel transformation to the final product.