Squaramide–Sulfonamide Organocatalyst for Asymmetric Direct Vinylogous Aldol Reactions
作者:Takaaki Sakai、Shin-ichi Hirashima、Yoshifumi Yamashita、Ryoga Arai、Kosuke Nakashima、Akihiro Yoshida、Yuji Koseki、Tsuyoshi Miura
DOI:10.1021/acs.joc.7b00287
日期:2017.5.5
Asymmetric direct vinylogous aldol reactions of furan-2(5H)-one with aldehydes in the presence of a catalytic amount of novel squaramide–sulfonamide organocatalyst resulted in the corresponding addition products with high to excellent enantioselectivities. This is the first successful report illustrating an example of highly stereoselective reactions using a squaramide–sulfonamide organocatalyst.
呋喃-2(5 H)-one与醛的不对称直接乙烯基醇醛缩合反应,在催化量的新型方酰胺-磺酰胺有机催化剂的存在下,导致相应的加成产物具有高到极好的对映选择性。这是第一个成功的报告,阐明了使用方酸酰胺-磺酰胺有机催化剂进行高度立体选择性反应的一个例子。