An efficient enantioselective method for asymmetric Michael addition of nitroalkanes to α,β-unsaturated aldehydes
作者:Yongcan Wang、Pengfei Li、Xinmiao Liang、Tony Y. Zhang、Jinxing Ye
DOI:10.1039/b717000a
日期:——
The addition of nitroalkanes to alpha,beta-unsaturated aldehydes under the catalysis of (S)-2-(diphenyl(trimethylsilyloxy)methyl)pyrrolidine and lithium acetate as additive afforded gamma-nitroaldehydes in good yield and up to 97% ee.
Remote Sulfonamido Group Enhances Reactivity and Selectivity for Asymmetric Michael Addition of Nitroalkanes to α,β-Unsaturated Aldehydes
作者:Yu-Chao Huang、Biing-Jiun Uang
DOI:10.1002/asia.201402516
日期:2014.9
The pyrrolidine–camphorsulfonamide‐based catalyst 1 a catalyzes the enantioselectiveconjugateaddition of nitroalkanes to α,β‐unsaturated aldehydes in the presence of five equivalents of water in iPrOH to give the corresponding chiral Michael adducts in good yields and high enantioselectivities (up to 99 % ee) with a catalystloading as low as 1 mol %.