Enantioselective beta-Boration of Acyclic Enones by a [2.2]Paracyclophane-Based N-Heterocyclic Carbene Copper(I) Catalyst

[摘要]：A new planar and centrally chiral bicyclic 1,2,4-triazolium salt has been synthesized from [2.2]paracyclophane and phenylglycinol. The N-heterocyclic carbene (NHC) copper(I) complex generated in situ by the reaction of the triazolium salt and Cu2O was an efficient catalyst for the asymmetric beta-boration of acyclic enones, producing beta-boryl ketones in high yields and enantioselectivities.

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