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。
Sequential Generation and Utilization of Radical and Anionic Species with a Novel Manganese−Lead Reducing Agent. Three-Component Coupling Reactions of Alkyl Iodides, Electron-Deficient Olefins, and Carbonyl Compounds