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
Amine-Linked N-Heterocyclic Carbenes: The Importance of an Pendant Free-Amine Auxiliary in Assisting the Catalytic Reaction
作者:Chia-Yi Li、Yi-Yin Kuo、Jie-Hong Tsai、Glenn P. A. Yap、Tiow-Gan Ong
DOI:10.1002/asia.201000829
日期:2011.6.6
amine group, leading to insight about the instability of NHCs arising from the intermolecular interaction of the dangling amine side‐arm. However, the pendant amine plays an important role with respect to the catalytic process, resuscitating the catalytic activity of unsaturated NHC’s through a synergistic effect invoked by the secondary amine. This proof of concept allows us to expand the spectrum of
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
Lee, Kang-sang; Zhugralin, Adil R.; Hoveyda, Amir H., Journal of the American Chemical Society, 2009, vol. 131, p. 7253 - 7255
作者:Lee, Kang-sang、Zhugralin, Adil R.、Hoveyda, Amir H.
DOI:——
日期:——
β-Boration of α,β-unsaturated carbonyl compounds in ethanol and methanol catalyzed by CCC-NHC pincer Rh complexes
作者:Sean W. Reilly、Gopalakrishna Akurathi、Hannah K. Box、Henry U. Valle、T. Keith Hollis、Charles Edwin Webster
DOI:10.1016/j.jorganchem.2015.11.010
日期:2016.1
Quantitative beta-boration of alpha, beta-unsaturated carbonyl compounds was achieved utilizing the eco-friendly solvent EtOH along with MeOH at room temperature in 1 h, by a CCC-NHC pincer Rh complex mixture. Substrates with beta-substituents were successfully converted yielding challenging, quaternary C-B bonds. The air-and water-stable pre-catalyst A, identified as a mixture of iodo and chloro CCC-NHC pincer Rh amine complexes, was evaluated for catalytic activity. This report is the first example of a pincer Rh complex demonstrating catalytic activity in a 1,4-addition at room temperature. (C) 2015 Elsevier B.V. All rights reserved.