作者:Pradhan, Suresh K.、Akamanchi, Krishnacharya G.、Divakaran, Pulukkunatt P.、Pradhan, Prakash M.
DOI:——
日期:——
A novel reductive cyclization involving attack by an oxime on an unconjugated alkyne, a new route to 4-aza sterols.
作者:Suresh K. Pradhan、Kirshnacharya G. Akamanchi、Pulukkunatt P. Divakaran
DOI:10.1016/s0040-4039(01)99837-5
日期:1983.1
N-hydroxy-3-methyl-4-aza sterols were produced by the action of NaBH4 on oximes of δ-ethynyl-5-oxo-4,5-secosterols. An unsaturated nitrone intermediate accounts for this reaction as well as for the facile transformation to dioximes of 3,5-dioxo-4,5-secosterols.