Studies on the construction of the 2-isooctyl side chain in 17-azasteroids
作者:J. W. Morzycki、Z. Łotowski
DOI:10.1007/bf00811765
日期:1995.1
The transformations of (20R)- and (20S)-3 beta-hydroxy-16-oxo-24-nor-17-azachol-5-eno-23-nitriles towards the 17-aza analogue of cholesterol are described. Attempts of a direct addition of a four carbon atom fragment to nitriles were unsuccessful. Alternately, nitriles were transformed via carboxylic acids, methyl esters and primary alcohols into iodides. The coupling reaction of(20S)-iodide with (i-Bu)(2)CuLi afforded the desired product in low yield but failed in the case of the 20R epimer.
BACK, THOMAS G.;LAI, ENOCH K. Y.;MORZYCKI, JACEK W., HETEROCYCLES, 32,(1991) N, C. 481-488
作者:BACK, THOMAS G.、LAI, ENOCH K. Y.、MORZYCKI, JACEK W.