Beverly Hills copper(II): A highly efficient catalytic asymmetric Nazarov reaction has been developed through control of the enantioselectivity of the cyclization step, affording chiral O-heterohexahydroindenones in excellent yields with excellent enantioselectivity and diastereoselectivity. HFIP=hexafluoro-2-propanol, BArF= tetrakis[3,5-bis(trifluoromethyl)phenyl] borate.
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Cao et al. (2010) studied this question.
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