Direct asymmetric aldol reactions in brine with recyclable fluorous β-aminosulfonamide organocatalysts
摘要:
Fluorous organocatalyst 3 promotes direct asymmetric aldol reactions of ketones with aldehydes in brine, leading to the synthesis of the corresponding anti-aldol products in high yields with up to 96% ee. Fluorous organocatalyst 3 is easily recovered by solid-phase extraction using fluorous silica gel and can be reused up to five times without purification. (C) 2011 Elsevier Ltd. All rights reserved.