Acylhydrazones of 20-keto steroids and their transformations: I. Synthesis and properties of 1′-acyl-substituted 3′-methylandrosteno[16,17-d]pyrazolines
摘要:
Acetates of 3 beta-hydroxy-3 '-methyl-1 '(N)-acylandrost-5-eno[16,17-d]pyrazolines bearing monothiooxamide acyl groups were synthesized during the study of approaches to the synthesis of 3 '-methylandrosteno[16,17-d]azoles, promising biologically active analogues of 20-keto pregnenanes, and their properties were investigated. The cyclization of Delta(16)-20-thiooxamidohydrazones to the corresponding heterocycles was shown to proceed under rigorous conditions and to depend partially on the nature of the oxamide grouping.
Effect of ω-substituents in the hydrazones of conjugated pregnane 20-ketosteroids on their ability to cyclize to pyrazolines
作者:A. V. Kamernitskii、E. I. Chernoburova、V. V. Chertkova、V. N. Yarovenko、I. V. Zavarzin、M. M. Krayushkin
DOI:10.1007/s11172-006-0559-6
日期:2006.11
The reactions of 3β-acetoxy-5-pregnan-20-one with thiooxamic acid hydrazides were studied. Depending on the nature of substituents in the thiohydrazide, the reactions give the corresponding hydrazones or pyrazolines resulting from hydrazone cyclization.