本文描述了一种实用且有效的叔丁醇钾 (KO t Bu)-促进羧酸与N , N-二甲胺的胺化。在催化量的 KO t Bu 存在下,在三甲基乙酸酐的帮助下,使用 DMF 作为二甲胺试剂,多种脂肪族和芳香族羧酸转化为N,N-二甲基酰胺。该协议的适用性通过复杂药物分子的后期二甲基酰胺化得到证明。涉及 KO t的似是而非的反应机制 在机理研究的基础上,提出了由甲酰胺分解和酸酐介导的缩合促进 Bu 促进的原位胺生成。
Chemoselective formal β-functionalization of substituted aliphatic amides enabled by a facile stereoselective oxidation event
作者:Adriano Bauer、Nuno Maulide
DOI:10.1039/c9sc03715b
日期:——
Aliphatic C-H functionalization is a topic of current intense interest in organic synthesis. Herein, we report that a facile and stereoselective dehydrogenation event enables the functionalization of aliphaticamides at different positions in a one-pot fashion. Derivatives of relevant pharmaceuticals were formally functionalized in the β-position in late-stage manner. A single-step synthesis of incrustoporine
Enantioselective Enolate Protonation with Chiral Anilines: Scope, Structural Requirements, and Mechanistic Implications
作者:E. Vedejs、A. W. Kruger、N. Lee、S. T. Sakata、M. Stec、E. Suna
DOI:10.1021/ja994437m
日期:2000.5.1
substitution at the γ-carbon, γ-protonation can be a competing reaction in the case of the aliphatic substrates 12, 14b, 14d, and 18. The evidence is most consistent with a mechanism that involves proton transfer from 1a to a mixed aggregate consisting of enolate 4a and the lithiated amide 5, but direct proton transfer from 1a to the enolate is not ruled out.