By treatment with perfluoro-cis-2-n-butyl-3-n-propyloxaziridine 1a, 5 beta-steroids 2a-i (belonging to different classes, such as androstanes, cholestanes, pregnanes, and cholanic acids) have been hydroxylated in good yields and with complete site selectivity and stereoselectivity to corresponding 5 beta-hydroxy derivatives 3a-i independently from the presence of halide, ketone, carboxylic acid, and ester moieties on C-3, C-11, C-12, C-17, C-20, C-21, and C-24.
PREPARATION AND ABSORPTION SPECTRA OF STEROIDS WITH 2,4-DINITROPHENYLHYDRAZONO GROUPS AT C-20 AND C-21
作者:GERARD A. FLEISHER、EDWARD C. KENDALL
DOI:10.1021/jo01144a009
日期:1951.4
Colton et al., Journal of Biological Chemistry, 1952, vol. 194, p. 235,243