Addition Reactions of Bis(pinacolato)diborane(4) to Carbonyl Enones and Synthesis of (pinacolato)<sub>2</sub>BCH<sub>2</sub>B and (pinacolato)<sub>2</sub>BCH<sub>2</sub>CH<sub>2</sub>B by Insertion and Coupling
作者:Hijazi Abu Ali、Israel Goldberg、Morris Srebnik
DOI:10.1021/om010282r
日期:2001.9.1
The title compound adds to α,β-unsaturated carbonyls to give the products of 1,4-addition after hydrolysis of the intermediate boron enolates, in 68−86% isolated yield (four examples). In addition, we discovered that diazomethane reacts with bis(pinacolato)diborane to insert methylene to give (pinacolato)2BCH2B in 83% yield. An alternative synthesis involved coupling of (pinacolato)BCH2I with various
Selective Formal Carbene Insertion into Carbon‐Boron Bonds of Diboronates by
<i>N</i>
‐Trisylhydrazones
作者:Zhicheng Bao、Meirong Huang、Yan Xu、Xinhao Zhang、Yun‐Dong Wu、Jianbo Wang
DOI:10.1002/anie.202216356
日期:2023.2.20
Intermolecular reaction of N-trisylhydrazones with bis (boryl) methane led to the transformation of 1,1-diboronate into 1,2-bis(boronates) via 1,2-borylmethyl migration. With unsymmetric diboronates with two different boryl moieties, the reaction proceeded with excellent regioselectivity. DFT studies reveal an unusual neighbouring boryl group effect that accounts for the observed regioselectivity.