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C–H Borylation Catalysis of Heteroaromatics by a Rhenium Boryl Polyhydride
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资源简介：
Transition
metal complexes bearing metal–boron bonds are
of particular relevance to catalytic C–H borylation reactions,
with iridium polyboryl and polyhydrido-boryl complexes the current
benchmark catalysts for these transformations. Herein, we demonstrate
that polyhydride boryl phosphine rhenium complexes are accessible
and catalyze the C–H borylation of heteroaromatic substrates.
Reaction of [K(DME)(18-c-6)][ReH4(Bpin)(η2-HBpin)(κ2-H2Bpin)] 1 with
1,3-bis(diphenylphosphino)propane (dppp) produced [K(18-c-6)][ReH4(η2-HBpin)(dppp)] 2 through
substitution of two equivalents of HBpin, and protonation of 2 formed the neutral complex [ReH6(Bpin)(dppp)] 3. Combined X-ray crystallographic and DFT studies show that 2 is best described as a σ-borane complex, whereas 3 is a boryl complex. Significantly, the boryl complex 3 acted as a catalyst for the C(sp2)–H borylation
of a variety of heteroarenes (14 examples including furan, thiophene,
pyrrole and indole derivatives) and displayed similar reactivity to
the iridium analogues.
创建时间：
2021-06-07
