Asymmetric conjugate addition to alkylidene malonates
作者:Alexandre Alexakis、Cyril Benhaim
DOI:10.1016/s0957-4166(01)00196-3
日期:2001.5
Dialkylzinc and trialkylaluminium reagents undergo conjugateaddition to alkylidene malonates with 0.5% copper triflate as catalyst. The reaction could be made enantioselective by completing the reaction in the presence of 0.5–1.0 mol% of chiral phosphorus ligand. Enantiomeric excesses (e.e.s) of up to 73% could be attained with a ligand prepared from TADDOL and 2-naphthylcyclohexanol.