Desymmetric Enantioselective Reduction of Cyclic 1,3-Diketones Catalyzed by a Recyclable <i>P</i>-Chiral Phosphinamide Organocatalyst
作者:Xu-Long Qin、Ang Li、Fu-She Han
DOI:10.1021/jacs.1c00277
日期:2021.2.24
The P-stereogenic phosphinamides are a structurally novel skeletal class which has not been investigated as chiral organocatalysts. However, chiral cyclic 3-hydroxy ketones are widely used as buildingblocks in the synthesis of natural products and bioactive compounds. However, general and practical methods for the synthesis of such chiral compounds remain underdeveloped. Herein, we demonstrate that
16-Oxa- and 16-thia-D-homo-estrogen derivatives useful as postcoital oral contraceptives which are produced by total synthesis from 1-vinyltetralin-1-ols or their thiuronium derivatives on reactions with 4-substituted tetrahydropyran- or tetrahydrothiopyran-3,5-diones, and subsequent appropriate modifications.
16-Oxa- and 16-thia-D-homo-estrogen derivatives useful as postcoital oral contraceptives which are produced by total synthesis from 1-vinyltetralin-1-ols or their thiuronium derivatives on reactions with 4-substituted tetrahydropyran- or tetrahydrothiopyran-3,5-diones, and subsequent appropriate modifications.
Totally synthetic steroid heterocycles.††Part IX, Terasawa T., and Okada T., J. ORG. CHEM. 46, 381 (1981). Part X. Synthesis of racemic a-nor-3.16-dithia- and 2-methyl-a-nor-3-oxa-16-thia-d-homo-1, 5(10),8,14-estratetraen-17a-ols
作者:T. Terasawa、T. Okada
DOI:10.1016/0039-128x(81)90045-3
日期:1981.4
Abstract As a part of synthetic modifications directed toward biologically active 16-thia- d -homoestrogens, synthesis of the title steroids via the Torgov-Wendler route is described.