Asymmetric Vinylogous Mannich Reactions: A Versatile Approach to Functionalized Heterocycles
作者:Shu-Tang Ruan、Jie-Min Luo、Yu Du、Pei-Qiang Huang
DOI:10.1021/ol2020384
日期:2011.9.16
Asymmetric vinylogous Mannich reaction (VMR) of 2-(tert-butyldimethylsilyloxy)furan (TBSOF, 1) with (RS)- or (SS)-t-BS-imines (3) furnished 5-aminoalkylbutenolides 7a–k in 75–87% yields with anti/syn ratios ranging from 75:25 to 97:3. Butenolides 7a–f,k were readily converted into substituted lactones 8 and 5 and 6-substituted 5-hydroxypiperidin-2-ones 11a–g, which are, in turn, key intermediates for
不对称插烯曼尼希反应的2-(VMR)(叔-butyldimethylsilyloxy)呋喃(TBSOF,1)和(- [R小号) -或(小号小号)-t -BS亚胺(3),得到5- aminoalkylbutenolides 7A-K在75 –87%的产率,反/合成比为75:25至97:3。丁烯内酯7a-f,k很容易转化为取代的内酯8和5和6-取代的5-羟基哌啶-2-酮11a-g,它们反过来又是合成许多生物活性化合物的关键中间体。