Urea derivative catalyzed enantioselective aldol reaction of isatins with ketones
作者:Li Ming Wang、Mei Jun Zhao、Zhe Chen、Hong Wen Mu、Ying Jin
DOI:10.1002/chir.22977
日期:2018.8
Urea derivative has been used to catalyze the asymmetricaldolreaction of isatins with ketones. The resulting 3‐alkyl‐3‐hydroxy‐indolin‐2‐ones products were obtained in good yields (70%‐94%) with high enantioselectivities (up to 87%ee).
Quinidine Thiourea-Catalyzed Aldol Reaction of Unactivated Ketones: Highly Enantioselective Synthesis of 3-Alkyl-3-hydroxyindolin-2-ones
作者:Qunsheng Guo、Mayur Bhanushali、Cong-Gui Zhao
DOI:10.1002/anie.201004161
日期:2010.12.3
New catalysis mechanism! The asymmetricaldolreaction of unactivated ketones and activated carbonyl compounds is realized with a quinidine‐derived thiourea catalyst (see scheme), and involves an enolate mechanism instead of the widely used enamine mechanism. With isatins as the substrate, the reaction can be applied to the enantioselective synthesis of biologically active 3‐hydroxyindolin‐2‐ones.