MeZnOMe-mediated reaction of aldehydes with Grignard reagents: A glance into nucleophilic addition/Oppenauer oxidation pathway
作者:Ying Fu、Xian-Zhen Ma、Chun-Zhao Shi、Tong Shen、Zhengyin Du
DOI:10.1002/aoc.4462
日期:2018.9
A novel organozincate of RMgX ⋅MeZnOMe ⋅LiCl type, formed in situ via transmetalation of Grignard reagent RMgBr ⋅LiCl with MeZnOMe, is shown to be an excellent organometallic species in the nucleophilic addition/Oppenauer oxidation of aldehydes to generate aromatic ketones in high yield. This transformation allows quick access to structurally diverse aryl, heteroaryl, benzyl and alkyl ketones with
The transition-metal-catalyst-free oxidative homocoupling of organomanganese reagents prepared by the insertion of magnesium into organic halides in the presence of MnCl<sub>2</sub>·2LiCl
作者:Zhihua Peng、Na Li、Xinyang Sun、Fang Wang、Lanjian Xu、Cuiyu Jiang、Linhua Song、Zi-Feng Yan
DOI:10.1039/c4ob01235f
日期:——
An oxidative homocoupling of organomanganese reagents was performed in one pot without an additional transition-metal catalyst.
Tandem nucleophilic addition–Oppenauer oxidation of aromatic aldehydes to aryl ketones with triorganoaluminium reagents
作者:Ying Fu、Yanshou Yang、Helmut M. Hügel、Zhengyin Du、Kehu Wang、Danfeng Huang、Yulai Hu
DOI:10.1039/c3ob40642c
日期:——
In the presence of pinacolone, the in situ prepared triorganoaluminium reagents reacted with aromatic aldehydes to give ketones in moderate to high yield. We propose that the products are formed via a tandem organoaluminium reagents addition–Oppenauer oxidation sequence.
A Nickel Catalyst for the Addition of Organoboronate Esters to Ketones and Aldehydes
作者:Jean Bouffard、Kenichiro Itami
DOI:10.1021/ol9017613
日期:2009.10.1
Ni(cod)2/IPr catalyst promotes the intermolecular 1,2-addition of arylboronate esters to unactivated aldehydes and ketones. Diaryl, alkyl aryl, and dialkyl ketones show good reactivity under mild reaction conditions (≤80 °C, nonpolar solvents, no strong base or acid additives). A dramatic ligand effect favors either carbonyl addition (IPr) or C−OR cross-coupling (PCy3) with aryl ether substrates. A Ni(0)/Ni(II)