Organocatalytic Michael Addition of Nitro Esters to α,β-Unsaturated Aldehydes: Towards the Enantioselective Synthesis of<i>trans</i>-3-Substituted Proline Derivatives
作者:Man-Yi Han、Yong Zhang、Huai-Zhen Wang、Wan-Kai An、Bao-Chun Ma、Yuan Zhang、Wei Wang
DOI:10.1002/adsc.201200538
日期:2012.10.8
five-step strategy has been developed for the enantioselective synthesis of trans-3-substituted proline derivatives with high diasteroselectivity (dr>20:1) and enantioselectivity (up to 97% ee). The key step is the asymmetric organocatalyticMichaeladdition of nitro esters to α,β-unsaturatedaldehydes, which affords the chiral Michael adducts in high yields (up to 96%) and excellent enantioselectivity