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Enantioselective bromocyclization of 2-geranylphenols induced by chiral phosphite–urea bifunctional catalysts†
Yasuhiro Sawamura,Yoshihiro Ogura,Hidefumi Nakatsuji,Akira Sakakura,Kazuaki Ishihara
Chemical Communications Pub Date : 03/18/2016 00:00:00 , DOI:10.1039/C6CC00229C
Abstract

Chiral phosphite–urea bifunctional catalysts have been developed for the enantioselective bromocyclization of 2-geranylphenols with N-bromophthalimide (NBP) for the first time. The chiral triaryl phosphite moiety activates NBP to generate a bromophosphonium ion. On the other hand, the urea moiety interacts with a hydroxyl group of the substrate through hydrogen bonding interactions. Enantioselectivity is effectively induced through two-point attractive interactions between the catalyst and the substrate.

Graphical abstract: Enantioselective bromocyclization of 2-geranylphenols induced by chiral phosphite–urea bifunctional catalysts
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