On reduction of α,β-unstaurated ketones and the respective allylic alcohols, bearing a phenylsulfonyl or phenylsulfanyl group in the α position. Hydroxy group-controlled stereoselective reduction of 3α- and 3β-hydroxy-4-(phenylsulfonyl)cholest-4-ene
cholestane 7a, respectively. Reduction of 4-(phenylsulfonyl)cholest-4-en-3-one 2 with lithium aluminohydride yields compound 8. Reduction of compounds 2, 13a and 15a with other metal hydrides affords mixtures of diastereomeric products. Metal hydridereductions of 4-(phenylsulfanyl)cholest-4-en-3-one 1 affect the carbonyl group only. Catalytic hydrogenation of compound 2 gives a mixture of 5α- and
Hydroxy-steroids. Part XI. The preparation and infrared spectra of vicinal cholestanediols
作者:C. W. Davey、E. L. McGinnis、J. M. McKeown (née Chancellor)、G. D. Meakins、M. W. Pemberton、R. N. Young
DOI:10.1039/j39680002674
日期:——
Twenty-eight vicinal cholestanediols (positions 1,2; 2,3; 3,4; 4,5; 5,6; 6,7; and 7,8) have been prepared by unambiguous routes starting from the corresponding olefins. The O–H stretching bands of dilute solutions of these diols and of seven reference compounds have been examined under high dispersion. Characteristic differences between ax,ax, ax,eq, and eq,eq compounds were observed. It was concluded
Synthetic methods for, and some reactions of the steroidal 2,3- and 3,4-episulphides and relatedcompounds are described. The five-membered ring formation, e.g. acetonide, trithiocarbonate etc., of the 2,3-trans-diaxial dimercapto and mercapto-ol derivatives are also studied.
Herein are described two general syntheses of episulphides as applied to steroids and involving α-hydroxy-xanthates and α-hydroxy-thiocyanates. The more precise stereochemistry in the synthetic sequences in steroids as compared to the hitherto investigated low mol. wt compounds serves to substantiate earlier proposed mechanisms of episulphide and trithiocarbonate formation. The stereochemical consequences