Synthesis of corticoids from 9.alpha.-hydroxyandrost-4-ene-3,17-dione
摘要:
The synthesis of 17-alpha,21-bis(acetyloxy)-16-beta-methylpregna-4,9(11)-diene-3,20-dione (24) from the sterol-derived 9-alpha-hydroxyandrost-4-ene-3,17-dione (1) has been completed. The key steps in the synthesis are 16-beta-methylation and conversion of the 17-ketone to 17-beta-cyanohydrin 11. Elaboration of 11 to 9-alpha-hydroxy-16-beta-methylpregn-4-ene-3,20-dione (15) followed by 21-acetoxylation and simultaneous introduction of 9,11-unsaturation and 17-alpha-acetoxylation gave 24.
Synthesis of corticoids from 9.alpha.-hydroxyandrost-4-ene-3,17-dione
摘要:
The synthesis of 17-alpha,21-bis(acetyloxy)-16-beta-methylpregna-4,9(11)-diene-3,20-dione (24) from the sterol-derived 9-alpha-hydroxyandrost-4-ene-3,17-dione (1) has been completed. The key steps in the synthesis are 16-beta-methylation and conversion of the 17-ketone to 17-beta-cyanohydrin 11. Elaboration of 11 to 9-alpha-hydroxy-16-beta-methylpregn-4-ene-3,20-dione (15) followed by 21-acetoxylation and simultaneous introduction of 9,11-unsaturation and 17-alpha-acetoxylation gave 24.
[EN] PROCESS FOR 9 alpha -HYDROXY STEROID DEHYDRATION
申请人:——
公开号:WO1991014700A2
公开(公告)日:1991-10-03
[EN] A process for preparing novel corticosteroid intermediates of formula (XXX) are disclosed. The process entails contacting a 9 alpha -hydroxysteroid of formula (XX) with (A) in step (a) an anhydride, an organic acid and an acid reagent having a pKa of about 3 or less, followed by step (b) treatment with water, aqueous alkali or aqueous acid; or alternatively, with (B) either an anhydride and a proton acceptor or with an acyl halide and a proton acceptor, to give the steroid of formula (XXX). By using step (a) in Proces (A), novel steroid intermediates of formula (XXV) are also obtained. [FR] Procédé de préparation de nouveaux intermédiaires de corticostéroïdes de la formule (XXX). Le procédé consiste à mettre en contact un 9alpha-hydroxystéroïde de la formule (XX) avec (A) dans l'étape (a) un anhydride, un acide organique et un réactif acide ayant un pKa d'environ 3 au moins, suivie par l'étape (b) de traitement à l'aide d'eau, d'alcali aqueux ou d'acide aqueux; ou selon un autre mode de réalisation, avec (B) soit un anhydride et un accepteur de protons, soit un halogénure d'acyle et un accepteur de protons, afin d'obtenir le stéroïde de la formule (XX). L'emploi de l'étape (a) dans le procédé (A) permet également d'obtenir de nouveaux intermédiaires de stéroïdes de la formule (XXV).