aliphatic (linear and branched)-substituted cyclic enones with five-, six-, and seven-membered ring sizes. Due to the synthetic versatility of organoboron compounds, a variety of new chiral building blocks containing a chiral tetrasubstituted carbon was synthesized based on this methodology. Specifically, a one-pot three-component reaction from alpha,beta-substituted cyclic enone, bis(pinacolato)diboron (PinB-BPin:
Ligandless Copper-Catalyzed β-Boration of α,β-Unsaturated Compounds in Aqueous Solution
作者:Hee-Sung Chea、Hak-Suk Sim、Jae-Sook Yun
DOI:10.5012/bkcs.2010.31.03.551
日期:2010.3.20
water as a co-solvent and a reaction promoter exerted a positive effect on catalytic efficiency and resulted in the efficient β-boration of α,β-unsaturated carbonyl compounds including substituted enones and esters. This new, operationally simple method is useful for the preparation of racemic organoboron compounds.Our investigation of the borationreaction under ligand-free conditions began with β-monosubstituted
Heterogeneous versus Homogeneous Copper(II) Catalysis in Enantioselective Conjugate-Addition Reactions of Boron in Water
作者:Taku Kitanosono、Pengyu Xu、Shū Kobayashi
DOI:10.1002/asia.201300997
日期:2014.1
reported for the conjugateaddition of boron. Heterogeneous cat. 1 also gave high yields and enantioselectivities with some substrates and also gave the highest TOF (43 200 h−1) for an asymmetric conjugate‐additionreaction of boron. In addition, the catalyst systems were also applicable to the conjugateaddition of boron to α,β,γ,δ‐unsaturated carbonyl compounds, although such reactions have previously