The Synthesis of 1,4-Diketones via a One-pot Five-component Connecting Reaction Based on Two Acylations of Organozincs Promoted by the Catalysis of a Pd(0) Species
作者:Motoki Yuguchi、Masao Tokuda、Kazuhiko Orito
DOI:10.1246/cl.2004.674
日期:2004.6
Unsymmetrical 1,4-diketones were produced via a one-pot five-component connecting reaction based on two kinds of Pd(0)-catalyzed acylations of organozincs using acryloyl chloride and TMSCl in an atmosphere of carbon monoxide.
Stereoselective Negishi-like Couplings Between Alkenyl and Alkyl Halides in Water at Room Temperature
作者:Arkady Krasovskiy、Christophe Duplais、Bruce H. Lipshutz
DOI:10.1021/ol101885t
日期:2010.11.5
Mix in water and then stir. That is all that is required in this new approach to stereoselective sp3−sp2 cross-couplings between an alkyl and alkenyl halide. Prior formation of organozinc reagents is not required.
Palladium-Catalyzed Electrochemical Allylic Alkylation between Alkyl and Allylic Halides in Aqueous Solution
作者:Yin-Long Lai、Jing-Mei Huang
DOI:10.1021/acs.orglett.7b00473
日期:2017.4.21
A new route for the direct cross-coupling of alkyl and allylic halides using electrochemical technique has been developed in aqueous media under air. Catalyzed by Pd(OAc)2, the Zn-mediated allylicalkylations proceed smoothly between a full range of alkyl halides (primary, secondary, and tertiary) and substituted allylic halides. Protection–deprotection of acidic hydrogen in the substrates is avoided
The efficient cross-coupling reaction to afford ketones from pyridine carboxylic acid chlorides and alkylzinc reagents in the presence of Pd(phen)Cl 2 is reported. In the case of chloronicotinoyl chlorides, none ofNegishi cross-coupling products of 2-chloroazine moiety was formed. The catalyst loading could be reduced up to 0.01 mol%.
Catalyst-Free Formal Conjugate Addition/Aldol or Mannich Multicomponent Reactions of Mixed Aliphatic Organozinc Reagents, π-Electrophiles and Michael Acceptors
作者:Marine Pinaud、Marc Presset、Erwan Le Gall
DOI:10.3390/molecules28031401
日期:——
reagents with Michaelacceptors and aldehydes, ketones or activated imines are described. Primary, secondary and tertiary alkylzinc reagents, pre-generated in acetonitrile from the corresponding iodoalkanes, were used in the process, leading to the very efficient formation of a variety of β-hydroxycarbonyl compounds. The imines showed more contrasting results, due to the direct addition of the organozinc
描述了混合烷基锌试剂与迈克尔受体和醛、酮或活化亚胺的无催化剂多组分反应。该过程中使用了由相应的碘烷烃在乙腈中预先生成的伯、仲和叔烷基锌试剂,从而非常有效地形成各种β-羟基羰基化合物。由于有机锌化合物直接加成到 C=N 键上,亚胺显示出更具对比性的结果。涉及 TEMPO 的机理分析解释了反应的极性而不是自由基特征。