Simple Primary Amino Amide Organocatalyst for Enantioselective Aldol Reactions of Isatins with Ketones
作者:Jo Kimura、Ummareddy Venkata Subba Reddy、Yoshihito Kohari、Chigusa Seki、Yasuteru Mawatari、Koji Uwai、Yuko Okuyama、Eunsang Kwon、Michio Tokiwa、Mitsuhiro Takeshita、Tatsuo Iwasa、Hiroto Nakano
DOI:10.1002/ejoc.201600414
日期:2016.8
Enantioselective aldol reactions of various isatins with ketones using newly designed amino amide organocatalysts were found to provide chiral 3-substituted 3-hydroxy-2-oxindoles in good to excellent yields and with excellent stereoselectivities (up to 99 %, up to 98 % ee, syn/anti = 99:1); one catalyst, 3i, proved particularly successful. One of the resulting oxindoles, 3-hydroxy-3-(2-oxocyclohexyl)-2-indolinone
发现使用新设计的氨基酰胺有机催化剂,各种靛红与酮的对映选择性羟醛反应可提供手性 3-取代 3-羟基-2-羟吲哚,收率良好至极好,立体选择性(高达 99 %,高达 98 % ee,同步/反 = 99:1); 一种催化剂,3i,证明特别成功。所得羟吲哚中的一种,3-羟基-3-(2-氧代环己基)-2-吲哚酮可用作药学上重要化合物的合成中间体,并且就其本身而言,显示出有趣的抗惊厥活性。