Palladium-Catalyzed α-Arylation of Zinc Enolates of Esters: Reaction Conditions and Substrate Scope
作者:Takuo Hama、Shaozhong Ge、John F. Hartwig
DOI:10.1021/jo401476f
日期:2013.9.6
The intermolecular α-arylation of esters by palladium-catalyzed coupling of aryl bromides with zinc enolates of esters is reported. Reactions of three different types of zinc enolates have been developed. α-Arylation of esters occurs in high yields with isolated Reformatsky reagents, with Reformatsky reagents generated from α-bromo esters and activated zinc, and with zinc enolates generated by quenching
报道了通过芳基溴化物与酯的烯醇锌的钯催化偶联实现酯的分子间α-芳基化。已经开发出三种不同类型的烯醇锌的反应。使用分离的 Reformatsky 试剂、使用由 α-溴代酯和活化锌生成的 Reformatsky 试剂以及使用氯化锌猝灭酯的碱金属烯醇化物生成的锌烯醇化物,可以高产率进行酯的 α-芳基化。使用烯醇锌代替碱金属烯醇化物大大扩展了酯的芳基化范围。该反应在室温或 70 °C 下与含有氰基、硝基、酯、酮、氟、烯醇化氢、羟基或氨基官能团的溴代芳烃以及与溴代吡啶发生。酯的范围包括无环乙酸酯、丙酸酯和异丁酸酯、α-烷氧基酯和内酯。使用带有受阻五苯基二茂铁基二叔丁基膦(Q-phos)或高反应性二聚Pd(I)络合物[P( t -Bu) 3 ]PdBr} 2 的催化剂进行酯的烯醇锌的芳基化。
Nickel-Catalyzed Oxidative Coupling of Unactivated C(sp<sup>3</sup>)–H Bonds in Aliphatic Amides with Terminal Alkynes
作者:Fei-Xian Luo、Zhi-Chao Cao、Hong-Wei Zhao、Ding Wang、Yun-Fei Zhang、Xing Xu、Zhang-Jie Shi
DOI:10.1021/acs.organomet.6b00529
日期:2017.1.9
In this work, we demonstrated Ni-catalyzed oxidative coupling of unactivated C(sp(3))-H bonds with terminal alkynes for construction of C(sp(3))-C(sp) bonds to synthesize alkyl-substituted internal alkynes. Different amides exhibited good compatibility. Preliminary mechanistic studies were conducted to account for this alkynylation.
CHAKRABARTI, JIBAN K.;EGGLETON, RICHARD J.;GALLAGHER, PETER T.;HARVEY, JA+, J. MED. CHEM., 30,(1987) N 9, 1663-1668
作者:CHAKRABARTI, JIBAN K.、EGGLETON, RICHARD J.、GALLAGHER, PETER T.、HARVEY, JA+
DOI:——
日期:——
α-Arylation of Esters and Ketones Enabled by a Bench-Stable Pd(I) Dimer Catalyst
作者:Franziska Schoenebeck、Theresa Sperger
DOI:10.1055/s-0037-1610087
日期:2018.11
Published as part of the Special Section dedicated to Scott E. Denmark on the occasion of his 65th birthday Abstract A procedure for the α-arylation of α,α-disubstituted esters and ketones to generate quaternary carbon centers is described. The developed protocol is operationally simple and employs an air- and moisture-stable dinuclear Pd(I) complex [Pd(μ-I)(Pt-Bu3)]2 to mediate selective α-arylation
发布时间作为的一部分奉献给斯科特E.丹麦在他65之际特科次生日 抽象的 描述了α,α-二取代的酯和酮的α-芳基化以生成季碳中心的方法。所开发的方案操作简单,并采用了空气和水分稳定的双核Pd(I)络合物[Pd(μ-I)(P t -Bu 3)] 2来介导芳香族C–I / Br的选择性α-芳基化存在芳族C–Cl和/或C–OTf位点的碳键。 描述了α,α-二取代的酯和酮的α-芳基化以生成季碳中心的方法。所开发的方案操作简单,并采用了空气和水分稳定的双核Pd(I)络合物[Pd(μ-I)(P t -Bu 3)] 2来介导芳香族C–I / Br的选择性α-芳基化存在芳族C–Cl和/或C–OTf位点的碳键。
5-Acyl-3-substituted benzofuran-2(3H)-ones as potential antiinflammatory agents
作者:Jiban K. Chakrabarti、Richard J. Eggleton、Peter T. Gallagher、Janette Harvey、Terence A. Hicks、E. Ann Kitchen、Colin W. Smith
DOI:10.1021/jm00392a024
日期:1987.9
acids were synthesized. The antiinflammatory activity was evaluated in terms of their ability to improve adjuvant induced arthritis in rats. Their effect on the production of both cyclooxygenase (CO) and lipoxygenase (LO) metabolites of arachidonic acid in guinea pig peritoneal polymorphonuclear neutrophils (PMNs) was also examined. No correlation between the antiinflammatory activity and increasing stability