摘要：

AC2-symmetric diamine serves as the organocatalyst in an asymmetric -chlorination reaction of simple ketones (e.g., cyclohexanone, diethyl ketone). Optically active -chloroketones are formed with excellent enantioselectivities using N-chlorosuccinimide (NCS) as the chlorine source (see scheme). These products have broad synthetic utility, in particular for pharmaceutical applications.

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