Na2CO3-Catalyzed N-Acylation of Indoles with Alkenyl Carboxylates
作者:Xiao-Yu Zhou、Xia Chen
DOI:10.1055/s-0037-1609937
日期:2019.1
Abstract The N-acylation of indoles has been accomplished via inorganic base catalysis. It provided an efficient and simple catalysis system for the preparation of N-acylindoles with alkenyl carboxylates as acylating agents. A broad variety of indoles undergo the smooth N-acylation using Na2CO3 as catalyst in MeCN at 120 °C to give the corresponding N-acylindoles in good to excellent yields. The N-acylation
摘要 吲哚的N-酰化已经通过无机碱催化完成。它为以链烯基羧酸盐为酰化剂制备N-酰化吲哚提供了有效而简单的催化体系。使用Na 2 CO 3作为催化剂在MeCN中于120°C对多种吲哚进行平滑的N-酰化反应,从而以良好或极好的收率得到相应的N-酰基吲哚。 吲哚的N-酰化已经通过无机碱催化完成。它为以链烯基羧酸盐为酰化剂制备N-酰化吲哚提供了有效而简单的催化体系。使用Na 2 CO 3作为催化剂在MeCN中于120°C对多种吲哚进行平滑的N-酰化反应,从而以良好或极好的收率得到相应的N-酰基吲哚。
Photoredox/HAT-Catalyzed Dearomative Nucleophilic Addition of the CO<sub>2</sub> Radical Anion to (Hetero)Aromatics
作者:Saeesh R. Mangaonkar、Hiroki Hayashi、Hideaki Takano、Wataru Kanna、Satoshi Maeda、Tsuyoshi Mita
DOI:10.1021/acscatal.2c06192
日期:2023.2.17
exhibits high reactivity in single-electron reduction reactions due to the concomitant release of stable CO2, or Giese-type reactions, especially for electron-deficient alkenes and styrene derivatives. In contrast to previous reports, we herein disclose the development of a robust method for the introduction of CO2•–, which can be generated from cesium formate under photoredox/hydrogen atom transfer (HAT)
CO 2的自由基阴离子(CO 2 •– ) 是一种强亲核自由基,在现代有机化学中应用迅速。由于伴随释放稳定的 CO 2或 Giese 型反应,这种自由基物种在单电子还原反应中表现出高反应性,尤其是对于缺电子烯烃和苯乙烯衍生物。与之前的报告相比,我们在此披露了引入 CO 2的稳健方法的开发•–,可在光氧化还原/氢原子转移 (HAT) 催化下由甲酸铯生成,转化为稳定的杂芳烃,如苯并呋喃、苯并噻吩和吲哚衍生物,以提供合成有用的 α-氧、α-硫代和 α-氨基酸衍生物中高产。此外,当使用缺电子萘衍生物时,单电子还原和Giese型亲核加成同时发生,可以高产率地制备羧化四氢萘衍生物。此外,一种带有氰基的四氢萘通过氢化和环化还原氰基官能团,转化为相应的γ-丁内酰胺。据我们所知,