Structure of 3β-hydroxy-16-oxo-24-nor-17-azachol-5-eno-23-nitrile and its 20S epimer
作者:Jacek W. Morzycki、Zenon Łotowski、Leszek Siergiejczyk、Janusz Lipkowski、Anna Tabaszewska、Jacek Wójcik
DOI:10.1016/0039-128x(94)00037-d
日期:1995.2
The structures of the title compounds have been investigated in solid state by X-ray and in solution by NMR methods. The configurations at C20 and the preferred conformations of both epimers were established. A full assignment of signals in H-1 and C-13 NMR spectra was done.
N-Alkylation of 17-azasteroids
作者:J MORZYCKI、Z LOTOWSKI
DOI:10.1016/0039-128x(94)90042-6
日期:1994.1
N-Alkylation of 17-azasteroid lactams (16-oxo-17-azaandrost-5-en-3 beta-ol acetate 3 and its D-homo analog 4) was studied. It has been found that both lactams are readily alkylated with iodomethane or iodoethane. In contrast to this there was no reaction with 2-iodo-6-methylheptane due to the steric hindrance. 1,4-Addition of lactam to the conjugated systems was also studied. The addition to acrylonitrile proved to be easy compared to crotononitrile. However the efficient addition to the latter compound was also attained by using potassium t-butoxide as a base in t-butanol.
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.