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Xiao-Guang Song, Prof. Shou-Fei Zhu, Xiu-Lan Xie and Prof. Qi-Lin Zhou Enantioselective Copper-Catalyzed Intramolecular Phenolic O[BOND]H Bond Insertion: Synthesis of Chiral 2-Carboxy Dihydrobenzofurans, Dihydrobenzopyrans, and Tetrahydrobenzooxepines Angewandte Chemie International Edition 52

Article first published online: 31 JAN 2013 | DOI: 10.1002/anie.201209455

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Efficient: A copper-catalyzed enantioselective intramolecular insertion of carbenoids into phenolic O[BOND]H bonds has been developed. This method can be used for the synthesis of the title compounds in high yields and excellent enantioselectivities under mild and neutral conditions (see scheme). NaBArF=sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate.

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