Magnesium salt promoted tandem nucleophilic addition–Oppenauer oxidation of aldehydes with organozinc reagents
作者:Ying Fu、Xing Ling Zhao、Hulmet Hügel、Danfeng Huang、Zhengyin Du、Kehu Wang、Yulai Hu
DOI:10.1039/c6ob01668e
日期:——
A magnesium salt promoted synthesis of ketones via tandem nucleophilic addition–Oppenauer oxidation of aldehydes using organozinc chemistry was demonstrated. Magnesium salts concomitantly generated via magnesium metal mediated organohalide zincation exhibit high efficacy for nucleophilic addition of organozinc reagents to aromatic aldehydes and thereafter Oppenauer oxidation whereby ketones are formed
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
A simple, efficient and metal-free route for the synthesis of dissymmetric ketones through Suzuki type cross-coupling reaction has been established. This strategy signifies an attractive, cost-effective and operationally convenient tool for the synthesis of a wide range of dissymmetric ketones. Although conventional routes for the synthesis of ketones have been widely used, the potential challenge
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.
aldehydes and organoboronic acids was achieved in the presence of P(1-nap)3, using Cs2CO3 in toluene, providing diaryl ketones with yields ranged from moderate to excellent. The efficiency of this reaction was demonstrated by the compatibility with nitro, cyano, trifluoromethyl, fluoro and chloro groups. Moreover, the rigorous exclusion of air/moisture is not required in these transformations.
在甲苯中使用Cs 2 CO 3在P(1-nap)3的存在下,实现了Pd催化的醛与有机硼酸的偶联型反应,提供了产率从中等到优异的二芳基酮。通过与硝基,氰基,三氟甲基,氟和氯基团的相容性证明了该反应的效率。此外,在这些转换中不需要严格排除空气/水分。