Catalytic Asymmetric Bromine-Lithium Exchange: A New Tool to Build Axial Chirality
作者:Quentin Perron、Alexandre Alexakis
DOI:10.1002/adsc.201000517
日期:2010.10.4
We present here the first catalytic desymmetrization of the 2,2′,6,6′-tetrabromobiphenyl 1 and analogues, by a bromine-lithiumexchange catalyzed by either diamines or diether derivatives (0.5 equiv.), yielding axiallychiral compounds in high yield (up to 89%) and high enantioselectivity (up to 82%).