N-methylated products of the Solanum steroidal alkaloids tomatidine and solasodine
作者:Hugo E. Gottlieb、Igor Belic、Radovan Komel、Miljenko Mervic
DOI:10.1039/p19810001888
日期:——
The Solanum steroidal alkaloids tomatidine and solasodine contain a spiro-ring junction with azaketal functionality. The conversion of the natural products to their N-methylated derivatives involves intermediates in which the formerly spiro-carbon (C-22) is sp2 hybridized, and therefore the stereochemical information at this centre is lost. 13C N.m.r. analysis is used to show that methylation of tomatidine
在茄属甾族生物碱tomatidine和澳洲茄胺包含具有azaketal功能的螺环结。天然产物向其N-甲基化衍生物的转化涉及中间体,其中以前的螺碳(C-22)与sp 2杂交,因此失去了该中心的立体化学信息。13 C Nmr分析用于显示番茄碱(22 S,25 S)甲基化可产生一种(22 S,25 S)产物,而对solasodine(22 R,25 R)进行相同处理可得到两种可以平衡的异构体在解决方案中,有22R,25 R(主要)和22 S,25 R(次要)立体化学。产品的13 C nmr衍生构象为这些结果提供了解释。