Copper(II) bromide-catalyzed conjugate addition of furans to α,β-unsaturated carbonyl compounds
作者:Alexander A. Fadeev、Maxim G. Uchuskin、Igor V. Trushkov、Anton S. Makarov
DOI:10.1007/s10593-018-2206-1
日期:2017.12
A simple method for the synthesis of 2-(3-oxoalkyl)furan derivatives based on conjugate addition of 2-substituted furans to various α,β-unsaturated carbonyl compounds in the presence of copper(II) bromide as catalyst was developed.
Chiral aldehyde catalysis is uniquely suitable for the direct asymmetric α-functionalization of N-unprotected amino acids, because aldehydes can reversibly form imines. However, there have been few successful reports of these transformations. In fact, only chiral aldehyde catalyzed aldol reactions of amino acids and alkylation of 2-amino malonates have been reported with good chiral induction. Here
Iridium and copper supported on silicon dioxide as chemoselective catalysts for dehydrogenation and borrowing hydrogen reactions
作者:Guanxin Zhu、Zheng-Chao Duan、Haiyan Zhu、Minghui Qi、Dawei Wang
DOI:10.1016/j.mcat.2021.111516
日期:2021.4
benzotriazole-pyridinyl-silane ligand (BPS) was designed, and the corresponding iridium and copper catalysts were synthesized and thoroughly characterized by means of EDS, TEM, and XPS. The resulting iridium composite revealed excellent catalytic activity for the reaction of tert-butanesulfinamide with benzyl alcohols, while copper catalyst could realize the synthesis of unsaturated carbonyl compounds through
This work describes an electrochemicalammoniumcation enabled hydropyridylation of ketone-activated alkenes under metal- and exogenous reductant free conditions giving access to β-pyridyl ketones, through dual proton-coupled electron transfer and radical cross-coupling. It features a broad substrate scope and allows a gram-scale synthesis. Ammonium chloride plays various roles in this transformation
Iron-Catalyzed Hydroboration of Vinylcyclopropanes
作者:Chenhui Chen、Xuzhong Shen、Jianhui Chen、Xin Hong、Zhan Lu
DOI:10.1021/acs.orglett.7b02691
日期:2017.10.6
An iron-catalyzed hydroboration of vinylcyclopropane with HBpin is first reported for the preparation of valuable homoallylic organoboronic esters. The iron catalysts enable efficient and regioselective C–C cleavage of vinylcyclopropanes, stereoselectively delivering E-alkenes with good stereospecific selectivity at an allylic position. This protocol exhibits mild conditions with good functional group