Photoinduced, Copper-Catalyzed Alkylation of Amides with Unactivated Secondary Alkyl Halides at Room Temperature
作者:Hien-Quang Do、Shoshana Bachman、Alex C. Bissember、Jonas C. Peters、Gregory C. Fu
DOI:10.1021/ja4126609
日期:2014.2.5
The development of a mild and general method for the alkylation of amides with relatively unreactive alkyl halides (i.e., poor substrates for SN2 reactions) is an ongoing challenge in organic synthesis. We describe herein a versatile transition-metal-catalyzed approach: in particular, a photoinduced, copper-catalyzed monoalkylation of primary amides. A broad array of alkyl and aryl amides (as well as
开发一种温和而通用的方法,用相对不活泼的卤代烷(即 SN2 反应的不良底物)对酰胺进行烷基化是有机合成中的一个持续挑战。我们在此描述了一种通用的过渡金属催化方法:特别是光诱导、铜催化的伯酰胺单烷基化。一系列广泛的烷基和芳基酰胺(以及内酰胺和 2-恶唑烷酮)与未活化的仲(和受阻伯)烷基溴和碘结合使用一组相对简单和温和的条件:廉价的 CuI 作为催化剂,无需单独添加配体,并在室温下形成 CN 键。该方法与多种官能团兼容,例如烯烃、氨基甲酸酯、噻吩和吡啶,并已应用于阿片受体拮抗剂的合成。一系列机械观察,包括反应性和立体化学研究,与耦合途径一致,包括铜-酰胺络合物的光激发,然后是电子转移以形成烷基。
The use of microwave radiations and propylphosphonic anhydride (T3P®) for rapid and highly yielding amide bond formation and peptide coupling
作者:Elisa Rouge、Jean Michel Brunel
DOI:10.1016/j.tet.2023.133813
日期:2024.1
An improved, fast, and efficient procedure for amide bondformation and peptide coupling is reported leading to the expected corresponding derivatives in good to excellent isolated yields ranging from 26 to 90%. The outcome of the reaction was also investigated in relation to the influence of different parameters such as the nature of the solvent, the temperature as well as the amine/carboxylic acid
Preparation of polymer-bound pyrazolone active esters for combinatorial chemistry
作者:Jang-Woong Byun、Dong-Hoon Lee、Yoon-Sik Lee
DOI:10.1016/j.tetlet.2003.09.044
日期:2003.10
The preparation of solid-phase active esters from a new pyrazolone linker resin is described. N-Acylation using this resin provides various amide products with a high conversion rate and good purity under mild conditions. The polymer-bound pyrazolone linkers are stable in the reaction conditions and are resistant to hydrolysis. Moreover, this resin can also be reused repeatedly without a loss of reactivity. (C) 2003 Published by Elsevier Ltd.
Chemoselective synthesis of ketones and ketimines by addition of organometallic reagents to secondary amides
作者:William S. Bechara、Guillaume Pelletier、André B. Charette
DOI:10.1038/nchem.1268
日期:2012.3
is of great importance, as this motif serves as a synthetic handle for the elaboration of numerous organic functionalities. In this context, we report a general and chemoselective method based on an activation/addition sequence on secondaryamides allowing the controlled isolation of structurally diverse ketones and ketimines. The generation of a highly electrophilic imidoyl triflate intermediate was
Nickel-catalyzed reductive amidation of aryl-triazine ethers
作者:Majid M. Heravi、Farhad Panahi、Nasser Iranpoor
DOI:10.1039/c9cc08727c
日期:——
The reaction of activated phenoliccompounds, 2,4,6-triaryloxy-1,3,5-triazine (aryl-triazine ethers), with various isocyanates or carbodiimides in the presence of a nickel pre-catalyst resulted in the synthesis of aryl amides in good to excellent yields.