Herein, we describe a convenient and general method for the oxidation of olefins to ketones using either tris(dibenzoylmethanato)iron(III) [Fe(dbm)3] or a combination of iron(II) chloride and neocuproine (2,9-dimethyl-1,10-phenanthroline) as catalysts and phenylsilane (PhSiH3) as additive. All reactions proceed efficiently at room temperature using air as sole oxidant. This transformation has been
Catalytic Acceptorless Dehydrogenation of Aliphatic Alcohols
作者:Hiromu Fuse、Harunobu Mitsunuma、Motomu Kanai
DOI:10.1021/jacs.0c00123
日期:2020.3.4
aliphatic secondary alcohols to ketones undervisiblelight irradiation at room temperature by devising a ternary hybrid catalyst system comprising a photoredox catalyst, a thiophosphate organocatalyst, and a nickel catalyst. The reaction proceeded through three main steps: hydrogen atom transfer from the α-C-H bond of an alcohol substrate to the thiyl radical of the photo-oxidized organocatalyst, interception
Site-Selective Ni-Catalyzed Reductive Coupling of α-Haloboranes with Unactivated Olefins
作者:Shang-Zheng Sun、Marino Börjesson、Raul Martin-Montero、Ruben Martin
DOI:10.1021/jacs.8b09425
日期:2018.10.10
A mild, chemo- and site-selective catalytic protocol that allows for incorporating an alkylboron fragment into unactivated olefins is described. The use of internal olefins enables C-C bond-formation at remote sp3 C-H sites, constituting a complementary and conceptually different approach to existing borylation techniques that are currently available at sp3 centers.
描述了一种温和的、化学和位点选择性催化协议,允许将烷基硼片段纳入未活化的烯烃。内烯烃的使用能够在远程 sp3 CH 位点形成 CC 键,这构成了对当前在 sp3 中心可用的现有硼酸化技术的补充和概念上不同的方法。
Titanocenes as Photoredox Catalysts Using Green‐Light Irradiation
作者:Zhenhua Zhang、Tobias Hilche、Daniel Slak、Niels R. Rietdijk、Ugochinyere N. Oloyede、Robert A. Flowers、Andreas Gansäuer
DOI:10.1002/anie.202001508
日期:2020.6.8
Irradiation of Cp2TiCl2 with green light leads to electronically excited [Cp2TiCl2]*. This complex constitutes an efficient photoredox catalyst for the reduction of epoxides and for 5‐exo cyclizations of suitably unsaturated epoxides. To the best of our knowledge, our system is the first example of a molecular titanium photoredox catalyst.
The evaluation of dicyclopentadienylsamarium as a reagent in organic synthesis
作者:J.L. Namy、J. Collin、J. Zhang、H.B. Kagan
DOI:10.1016/s0022-328x(00)99769-9
日期:1987.7
SmCp2, which is easily prepared from SmI2, has been screened as a reducing agent for organic chemistry. In particular, SmCp2 promotes the pseudo-Barbier reaction between carbonylcompounds (aldehydes and ketones) and aliphatic or allylic halides more efficiently than does SmI2.