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.
US3989724A
申请人:——
公开号:US3989724A
公开(公告)日:1976-11-02
Tetrahydropyran-2-ols
申请人:Hoffmann-La Roche Inc.
公开号:US03989724A1
公开(公告)日:1976-11-02
Stereo-specific total synthesis of steroidal materials. 7-Substituted 3-oxo-1-heptenes or variants thereof are reacted with 2-alkylcycloalkane-1,3-diones yielding 3-substituted 6a .beta.-alkyl-cyclopenta [f] [1] benzopyrans or naphtho [2,1-b] pyrans. These are then subjected to a selective catalytic hydrogenation followed by an introduction of a hydroxy, alkoxy or acyloxy group at the 4a-position to produce a 3-substituted 6a .beta.,4a-hydroxy, alkoxy or acyloxy perhydrocyclopenta [f] [1] benzopyran or perhydro-naphtho [2,1-b] pyran. These latter compounds are then converted into 4- or 5-(3-oxoalkyl)perhydroindene-5-ones or perhydronaphthalene-6-ones which in turn can be converted to known steroidal materials by known methods.