Chiral Primary Amine Catalyzed Asymmetric Direct Cross-Aldol Reaction of Acetaldehyde
作者:Shenshen Hu、Long Zhang、Jiuyuan Li、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1002/ejoc.201100267
日期:2011.6
The first primary aminocatalytic direct cross-aldol reaction of acetaldehyde is presented. Among the various vicinal diamines screened, the L-tert-leucine derivative 1c in conjunction with (H4SiW12O40)0.25 was identified as the optimal catalyst; good catalytic activity (up to 99 % yield in 4 h), and high enantioselectivities (up to 92 % ee) were achieved for a range of donors, including aromatic aldehydes
介绍了乙醛的第一个伯氨基催化直接交叉羟醛反应。在筛选的各种邻二胺中,L-叔亮氨酸衍生物1c与(H4SiW12O40)0.25结合被确定为最佳催化剂;对一系列供体(包括芳香醛和靛红衍生物)实现了良好的催化活性(4 小时内高达 99% 的产率)和高对映选择性(高达 92% ee)。乙醛水溶液和三聚乙醛可以方便地应用于该系统。