Regioselective reductions of β,β-disubstituted enones catalyzed by nonracemically ligated copper hydride
作者:Karl R. Voigtritter、Nicholas A. Isley、Ralph Moser、Donald H. Aue、Bruce H. Lipshutz
DOI:10.1016/j.tet.2011.10.056
日期:2012.4
2-additions to β,β-disubstitutedα,β-unsaturatedketones have been further explored. Asymmetric reductions of enones lacking an α-substituent can be achieved with CuH complexed by DTBM-SEGPHOS in Et2O at −25 °C leading to the generation of highly valuable nonracemic allylic alcohols. The corresponding 1,4-reductions can also be achieved using the same reaction conditions by switching the ligand to a JOSIPHOS