作者:Oliver E. Edwards、Gunnar Grue-Sørensen、Barbara A. Blackwell
DOI:10.1139/v97-104
日期:1997.6.1
including a Favorski-like ring contraction and amide oxidation by methanesulfonic acid, is presented. Detailed 1H and 13C assignments are made for many of the products, and ultraviolet absorption for seven steroidal enamides is tabled. Long-range homo- and heteronuclear NMR connectivities were used to confirm the structure of three dimeric compounds and to assign the configuration of the methoxy function of
N-methanesulfonyloxy-4-aza-5α-cholestan-3-one 的热解或光解得到 4-azacholestan-3-one, 4-aza-A-nor-B-homocholestan-3-one, 3-aza-one 的衍生物A-norcholestane、双(4-aza-3-oxocholest-5-en-6-yl)甲烷和双(3-aza-A-norcholestan-3-yl)尿素。相应的 5β-甲磺酸盐得到 5β(coprostane)类似物。提供了这些产物形成机制的证据,包括类 Favorski 环收缩和甲磺酸的酰胺氧化。对许多产品进行了详细的 1H 和 13C 分配,并列出了七种甾体烯酰胺的紫外线吸收。长程同核和异核 NMR 连通性用于确认三种二聚体化合物的结构,并将 4-aza-5-甲氧基-A-nor-β-homocholestan-3-one 的甲氧基官能团的构型指定为5α。