Enantioselective Synthesis of CF<sub>3</sub>
-Containing 3,2’-Pyrrolidinyl Spirooxindoles and Dispirooxindoles via Thiourea-Catalyzed Domino Michael/Mannich [3+2] Cycloaddition Reactions
作者:Ye Lin、Yong-Xing Song、Da-Ming Du
DOI:10.1002/adsc.201801608
日期:2019.3.5
An efficient and practical organocatalytic asymmetric domino Michael/Mannich [3+2] cycloaddition of N‐2,2,2‐trifluoroethylisatin ketimines and arylidene azlactones by using a hydroquinine‐derived thiourea as the catalyst has been disclosed. Under mild conditions, a broad range of CF3‐containing 3,2’‐pyrrolidinyl spirooxindole/ dispirooxindole derivatives bearing four adjacent stereogenic centers including
公开了一种有效且实用的有机催化不对称多米诺骨牌Michael / Mannich [3 + 2]通过使用对苯二酚衍生的硫脲作为催化剂,对N -2,2,2-三氟乙基Isatin酮亚胺和亚芳基a内酯进行的环加成反应。在温和条件下,以高收率(高达99%的收率)获得了具有四个非立体异构选择性(高达99%的收率)的范围广泛的含CF 3的3,2'-吡咯烷基二吡咯并吲哚/双螺并恶二唑衍生物,带有四个相邻的立体生成中心,包括两个邻位螺四价手性中心。 > 20:1 dr(在所有情况下)和对映选择性(高达> 99%ee)。