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
Enantioselective β-Boration of Acyclic Enones by a [2.2]Paracyclophane-Based N-Heterocyclic Carbene Copper(I) Catalyst
作者:Lei Zhao、Yudao Ma、Fuyan He、Wenzeng Duan、Jianqiang Chen、Chun Song
DOI:10.1021/jo302694d
日期:2013.2.15
N-heterocyclic carbene (NHC) copper(I) complex generated in situ by the reaction of the triazolium salt and Cu2O was an efficient catalyst for the asymmetric β-boration of acyclicenones, producing β-boryl ketones in high yields and enantioselectivities.
Synthesis and application of a dual chiral [2.2]paracyclophane-based N-heterocyclic carbene in enantioselective β-boration of acyclic enones
作者:Lei Wang、Zhen Chen、Manyuan Ma、Wenzeng Duan、Chun Song、Yudao Ma
DOI:10.1039/c5ob01609f
日期:——
An enantioselective conjugate addition of boron to α,β-unsaturated ketones catalysed by either a N-heterocyclic carbene or a copper–carbene complex generated in situ from a new chiral bicyclic triazolium based on [2.2]paracyclophane is presented. The dual chiral carbene–copper catalyst has significant advantages over its carbene counterpart as an organocatalyst in asymmetric β-boration of acyclic enones
Synthesis of fluorine-substituted [2.2]paracyclophane-based carbene precursors for copper-catalyzed enantioselective boration of α,β-unsaturated ketones
作者:Linyong Wang、Meng Ye、Lei Wang、Wenzeng Duan、Chun Song、Yudao Ma
DOI:10.1016/j.tetasy.2016.12.005
日期:2017.1
Fluorine-substituted [2.2]paracyclophane-based carbene precursors have been successfully synthesized and applied to copper-catalyzed asymmetric beta-boration of alpha,beta-unsaturated ketones. Fluorination of the planar chiral carbenes has a beneficial impact on the catalytic performance of the relevant complexes. A variety of chiral beta-boryl ketones were obtained in excellent yields (up to 99%) and with high enantioselectivities (up to 99% ee). (C) 2016 Elsevier Ltd. All rights reserved.