Selective Benzylic CH‐Borylations by Tandem Cobalt Catalysis
作者:Pradip Ghosh、Roland Schoch、Matthias Bauer、Axel Jacobi von Wangelin
DOI:10.1002/anie.202110821
日期:2022.1.3
An inexpensive cobalt catalyst enables the combination of benzylic CH-borylation and dehydrocoupling to an overall acceptorless dehydrogenative functionalization of hydrocarbons at mild conditions. Mechanisticstudies indicate a tandem catalysis via molecular CoI catalysts.
Benzyltriboronates: Building Blocks for Diastereoselective Carbon–Carbon Bond Formation
作者:W. Neil Palmer、Cayetana Zarate、Paul J. Chirik
DOI:10.1021/jacs.6b12896
日期:2017.2.22
A highly diastereoselective carbon-carbon bond-forming reaction involving the tandem coupling of benzyltriboronates, enoates, and alkyl halides is described. This method was enabled by the discovery of α-diimine nickel catalysts that promote the chemoselective triborylation of benzylic C(sp3)-H bonds using B2Pin2 (Pin = pinacolate). The C-H functionalization method is effective with methylarenes and
On the scope of the Pt-catalyzed Srebnik diborylation of diazoalkanes. An efficient approach to chiral tertiary boronic esters and alcohols via B-stabilized carbanions
作者:Andrew J. Wommack、Jason S. Kingsbury
DOI:10.1016/j.tetlet.2014.03.135
日期:2014.5
Conditions milder than those previously reported are shown to be generally applicable to the Pt-catalyzed insertion of non-carbonyl-stabilized diazoalkanes into B(2)pin(2). Selective transformation of one (pinacolato)boryl unit in the products is enabled by rapid, low-temperature deboronation in the presence of a Lewis base and genesis of a highly reactive B-stabilized carbanion. (C) 2014 Published by Elsevier Ltd.