Asymmetric phase-transfer mediated epoxidation of α,β-unsaturated ketones using catalysts derived from Cinchona alkaloids
作者： Barry Lygo , Philip G. Wainwright
DOI: 10.1016/S0040-4039(97)10779-1
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摘要: Abstract The enantioselective epoxidation of α,β-unsaturated ketones utilising Cinchona alkaloid-derived quaternary ammonium phase-transfer catalysts bearing an N-anthracenylmethyl function are presented. It has been found that the O-benzyl derivatives these in conjunction with sodium hypochlorite give high stereocontrol and application this process to synthesis a range trans-α,β-epoxy (e.e. 69–89%) is
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