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
Suginome, Hiroshi; Kaji, Makoto; Yamada, Shinji, Journal of the Chemical Society. Perkin transactions I, 1988, p. 321 - 326
作者:Suginome, Hiroshi、Kaji, Makoto、Yamada, Shinji
DOI:——
日期:——
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
Solvolysis of the methanesulphonate of 2,2-dimethylcholesterol
作者:S. R. Pathak、G. H. Whitham
DOI:10.1039/j39680000193
日期:——
A synthesis of 2,2-dimethylcholesterol (VI) from 5α-cholestan-3-one is described. Solvolysis of the methane-sulphonate of (VI) gives as the major product the corresponding cycloalcohol, 2,2-dimethyl-3α,5-cyclo-5α-cholestan-6β-ol. Apparently the cationic product-determining intermediate reacts predominantly by co-ordination with solvent at C-6.