Preparation of vinyl lactones and corresponding Mannich bases
申请人:Hoffmann-La Roche Inc.
公开号:US03984427A1
公开(公告)日:1976-10-05
Vinyl ketones and Mannich-bases obtained therefrom are useful as intermediates in the total synthesis of steroids having valuable pharmacological properties. These compounds are prepared by the low temperature reaction of a vinyl Grignard e.g., vinyl magnesium chloride with substituted .gamma., .delta. or .epsilon. lactones followed, if desired, by reaction of the vinyl ketone obtained with a primary or secondary amine. Particular compounds prepared by this procedure include 2-(2-substituted aminoethyl)-6-substituted-2-hydroxy-tetrahydropyrans and the tautomers thereof.
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.