Scope and Mechanism of the Pt-Catalyzed Enantioselective Diboration of Monosubstituted Alkenes
作者:John R. Coombs、Fredrik Haeffner、Laura T. Kliman、James P. Morken
DOI:10.1021/ja4041016
日期:2013.7.31
The Pt-catalyzed enantioselective diboration of terminal alkenes can be accomplished in an enantioselective fashion in the presence of chiral phosphonite ligands. Optimal procedures and the substrate scope of this transformation are fully investigated. Reaction progress kinetic analysis and kinetic isotope effects suggest that the stereodefining step in the catalytic cycle is olefin migratory insertion
The use of chiral alcohols to form the Lewis acid–base *RO− → bis(pinacolato)diboron adduct, in situ, provides an opportunity to induce asymmetry in the organocatalytic diboration of alkenes and complements the well established transition metal-mediated enantioselective diboration.
Transition-metal-free regioselective synthesis of alkylboronates from arylacetylenes and vinyl arenes
作者:Kai Yang、Qiuling Song
DOI:10.1039/c5gc02633d
日期:——
A transition-metal-free synthesis of alkylboronates from arylacetylenes or vinyl arenes and B2pin2via tandem borylation and protodeboronation has been developed. This reaction features with excellent regioselectivities, broad functional group tolerance and good yields in both small and gram scale.
Vicinal Diboration of Alkyl Bromides via Tandem Catalysis
作者:Xiao-Xu Wang、Lei Li、Tian-Jun Gong、Bin Xiao、Xi Lu、Yao Fu
DOI:10.1021/acs.orglett.9b01481
日期:2019.6.7
Vicinal diboration of alkylbromides via tandem catalysis is reported. The reported reaction exhibits a broad substrate scope, good functional group compatibility, and regioselectivity. Moreover, it shows good practicality due to the easy accessibility of alkylbromides in combination with diverse transformations of diboronates. Mechanism study indicates that terminal alkenes are generated selectively
Synthesis of 1,1-Organodiboronates
via Rh(I)Cl-Catalyzed Sequential Regioselective Hydroboration
of 1-Alkynes
作者:Kohei Endo、Takanori Shibata、Munenao Hirokami
DOI:10.1055/s-0028-1088131
日期:——
A Rh(I)Cl-DPPB-complex-catalyzed sequential hydroboration of aryl alkynes and aliphatic alkynes was achieved. The reaction proceeded with almost perfect regioselectivity to afford 1,1-organodiboronate compounds in moderate to good yield.