Copper(I)-Catalyzed Formal
Carboboration of Alkynes:
Synthesis of Tri- and Tetrasubstituted Vinylboronates
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Abstract
The first copper-catalyzed formal carboboration of alkynes,
in
which a C–B bond and a C–C bond are created in a single
catalytic cycle, is presented. The reaction proceeds with high regioselectivity
and <i>syn</i>-stereoselectivity to form tri- and tetrasubstituted
vinylboronic esters from commercially available bis(pinacolato)diboron.
A subsequent cross-coupling reaction gives access to highly substituted
alkenes