科研之友
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摘要
An approach based on combinations of various water compatible Lewis acids and lipophilic group containing amphiphilic prolinamide co-catalysts has been evaluated for the direct asymmetric Aldol reaction. From the broad screening of chloride salts from alkali metal to transition metal, LiCl, ZnCl2 and SnCl2 lead to the highest stereoselectivities. The optimized catalytic conditions (10 mol% prolinamide with 10 mol% MCl2 or 20 mol% LiCl at room temperature on water) gave anti-products with improved enantioselectivities (up to 99% ee) compared to the moderately stereoselective procedure based on prolinamide activation only.
- 出版日期2013-2
- 单位郑州大学
