Conjugate Addition Reactions of Allylic Copper Species Derived from Grignard Reagents: Synthetic and Spectroscopic Aspects
作者:Bruce H. Lipshutz、Claus Hackmann
DOI:10.1021/jo00103a042
日期:1994.12
A general study on the 1,4-addition chemistry of allyl, methallyl, crotyl, and prenyl Grignard-derived organocopper reagents has been conducted. While diallylic cuprates formed from such species are not effective Michael donors, the 1:1:1 combination of an allylic Grignard, CuBr.SMe(2), and Me(3)SiCl leads to high yields of 1,4-adducts. The stereo- and regiochemistry associated with the allylic ligand, where appropriate, has also been examined. Low temperature C-13 NMR studies provide insight as to the nature of these complexes.