Simple chiral crown ethers complexed with potassium tert-butoxide as efficient catalysts for asymmetric Michael additions
作者： Shin Aoki , Shigeki Sasaki , Kenji Koga
DOI: 10.1016/S0040-4039(01)93942-5
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摘要: Abstract Simple C2-symmetric chiral crown ether 1 complexed with KOtBu was found to work as an efficient catalyst in Michael additions cause high asymmetric induction. The results various ethers catalysts suggest that diaxial-like conformation of the vicinal methyl groups 1·potassium enolate complex is responsible for
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