Concise Total Syntheses of Aspalathin and Nothofagin
作者:Akop Yepremyan、Baback Salehani、Thomas G. Minehan
DOI:10.1021/ol100315g
日期:2010.4.2
Syntheses of the C-glycosyl flavone natural products aspalathin and nothofagin have been accomplished in eight steps from tribenzyl glucal, tribenzylphloroglucinol, and either 4-(benzyloxy)phenylacetylene or 3,4-bis(benzyloxy)phenylacetylene. The key step of the syntheses involves a highly stereoselective Lewis acid promoted coupling of 1,2-di-O-acyl-3,4,6-tribenzylglucose with tribenzylphloroglucinol