Studies on the Cu(I)-Catalyzed Regioselective <i>anti</i>-Carbometallation of Secondary Terminal Propargylic Alcohols
作者:Zhan Lu、Shengming Ma
DOI:10.1021/jo0524021
日期:2006.3.31
A highly regioselective Cu(I)-catalyzed anti-carbometallation of secondary terminal propargylicalcohols with 1° alkyl or aryl Grignard reagents affording 2-substituted allylic alcohols was developed. By using this method, optically active allylic alcohols can be prepared from the optically active propargylicalcohols without obvious loss of the enantiopurity. The cyclic organometallic intermediate
Ligand Control in Co-Catalyzed Regio- and Enantioselective Hydroboration: Homoallyl Secondary Boronates via Uncommon 4,3-Hydroboration of 1,3-Dienes
作者:Mahesh M. Parsutkar、Subhajit Bhunia、Mayukh Majumder、Remy F. Lalisse、Christopher M. Hadad、T.V. RajanBabu
DOI:10.1021/jacs.3c00181
日期:——
Enantiopure homoallylic boronate esters are versatile intermediates because the C–B bond in these compounds can be stereospecifically transformed into C–C, C–O, and C–N bonds. Regio- and enantioselective synthesis of these precursorsfrom 1,3-dienes has few precedents in the literature. We have identified reaction conditions and ligands for the synthesis of nearly enantiopure (er >97:3 to >99:1) homoallylic