Synthetic steroids. Part X. Preparation of (3S)- and (3R)-spiro-[5α-cholestane-3,2′-oxiran] and their corresponding 2α-methyl and 2,2-dimethyl analogues
作者:J. D. Ballantine、P. J. Sykes
DOI:10.1039/j39700000731
日期:——
The preparation is reported of the 3R- and 3S-forms of spiro-[5α-cholestane-3,2′-oxiran] and their 2α-methyl and 2,2-dimethyl derivatives. The six epoxides were synthesised by addition of methylene to the relevant 3-ketone with either dimethylsulphoxonium methylide or dimethylsulphonium methylide, or by peroxidation of the corresponding 3-methylene-steroid with either m-chloroperoxybenzoic acid or
The Transformation of Cyclic Alcohols into Cyclic Acetals through a New Oxygen Atom Insertion by Photolysis in the Presence of Lead Tetraacetate and Iodine
isolated products. Thus, cholesterol gave 4-oxa-A-homocholest-5-en-3-ol and its acetate in a 53% yield. The products differ considerably from those reported by us after the photolysis of the hypoiodites by using mercury(II) oxide and iodine as the reagents for generating the hypoiodites; they also differ from those in the oxidation of the steroidal alcohols with leadtetraacetate alone. The photolysis
Photoinduced transformations. Part 73. Transformations of five- (and six-) membered cyclic alcohols into five- (and six-) membered cyclic ethers - a new method of a two-step transformation of hydroxy steroids into oxasteroids
作者:Hiroshi Suginome、Shinji Yamada
DOI:10.1021/jo00194a015
日期:1984.10
Hasan, Mashooda; Rashid, Naghmana; Khan, Khalid Mohammed, Liebigs Annalen, 1995, # 5, p. 889 - 896
作者:Hasan, Mashooda、Rashid, Naghmana、Khan, Khalid Mohammed、Snatzke, Guenther、Duddeck, Helmut、Voelter, Wolfgang
DOI:——
日期:——
Synthesis and Reactions of Ring A Methylated Saturated Steroids<sup>1</sup>