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Dinuclear zinc-catalyzed asymmetric Friedel–Crafts alkylation/cyclization of 3-aminophenols with α,α-dicyanoolefins†
Hang Yan,Shi-Kun Jia,Yu-Huan Geng,Jiao-Jiao Han,Yuan-Zhao Hua,Min-Can Wang
Chemical Communications Pub Date : 08/31/2021 00:00:00 , DOI:10.1039/D1CC04177K
Abstract

An enantioselective Friedel–Crafts alkylation/cyclization tandem reaction of 3-aminophenols with α,α-dicyanoolefins has been performed successfully using a chiral dinuclear zinc catalyst, leading to a range of chiral 2-amino-4H-chromenes (up to 98% yield and >99% ee). To the best of our knowledge, this is the first asymmetric example of the dinuclear zinc-catalysed functionalization of aromatic C(sp2)–H bonds.

Graphical abstract: Dinuclear zinc-catalyzed asymmetric Friedel–Crafts alkylation/cyclization of 3-aminophenols with α,α-dicyanoolefins
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