Highly Efficient Proline Ester-based Nickel Catalysts for Michael Addition of Thiophenols to α,β-Enones
作者:Way-Zen Lee、Chien-Wei Chiang、Girish M. Kulkarni、Ting-Shen Kuo
DOI:10.1002/jccs.201200386
日期:2013.3
Two N3O2 pentadentate ligands, BMPP and BPPP, were prepared for synthesizing highlyefficient nickel catalysts, [Ni(BMPP)(CH3CN)](ClO4)2 (1) and [Ni(BPPP)(CH3CN)](BPh4)(ClO4) (2), for thia‐Michaeladdition of thiophenols to α,β‐enones. X‐ray structures of 1 and 2 revealed that a labile CH3CN molecule was bound to the nickel center of the catalysts. ESI‐MS spectroscopy indicated that thiolate replaced