Straightforward Enantioselective Access to γ-Butyrolactones Bearing an All-Carbon β-Quaternary Stereocenter
作者:Sara Meninno、Tiziana Fuoco、Consiglia Tedesco、Alessandra Lattanzi
DOI:10.1021/ol502148a
日期:2014.9.19
An enantioselective one-pot aldol/lactonization sequence has been developed to access highly challenging γ-butyrolactones bearing an all-carbon quaternary stereocenter at the β-position by reacting acylated succinic esters with aqueous formaldehyde in the presence of 3 mol % loading of a cinchona alkaloid-derived squaramide providing direct access to paraconic acid derivatives in high yield and fairly
已开发出一种对映选择性一锅羟醛/内酯化顺序,以在3摩尔%的金鸡纳气存在下,使酰化琥珀酸酯与甲醛水溶液反应,从而获得在β位带有全碳四元立体中心的高挑战性γ-丁内酯。生物碱衍生的方酰胺,可以高产率直接获得对锥酸衍生物,对映选择性相当好(高达88%ee)。