Regio- and Chemoselective
Diboration of Allenes with
Unsymmetrical Diboron: Formation of Vinyl and Allyl Boronic Acid Derivatives
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Abstract
A platinum-catalyzed
terminal diboration of 1,1-disubstituted allenes
using a differentially protected diboron is described. Diboration
occurs in a regio- and chemoselective fashion to furnish vinyl and
allyl boronates in good to excellent yield and selectivity. Transformation
of the bis-boronyl products to other functional groups as well as
in chemoselective cross-coupling is demonstrated
