An efficient method was developed for the synthesis of pyrano[4,3-b]indol-1(5H)-ones, which uses a protic ionic liquid [HTBD+][TFE–] as both the solvent and reaction promoter. The reactions could be efficiently carried out at atmospheric pressures of CO2, and various pyrano[4,3-b]indol-1(5H)-ones bearing versatile functionalities were obtained in moderate to high yields (71–99%).
开发了一种高效的吡喃并[4,3 - b ]吲哚-1(5 H)-酮的合成方法,该方法使用质子离子液体[HTBD + ] [TFE – ]作为溶剂和反应促进剂。该反应可以在大气压的CO 2压力下有效地进行,并以中等至高产率(71-99%)获得了具有多种功能的吡喃并[4,3 - b ]吲哚-1(5 H)-。
Organocatalyzed CO<sub>2</sub>Trapping Using Alkynyl Indoles
作者:Zhuo Xin、Camille Lescot、Stig D. Friis、Kim Daasbjerg、Troels Skrydstrup
DOI:10.1002/anie.201500233
日期:2015.6.1
organocatalyzed trapping of CO2 through CC and CO bond formation is reported. Alkynyl indoles together with catalytic amounts of an organic base and five equivalents of CO2 resulted in the formation new heterocyclic structures. These tricyclic indole‐containing products were successfully prepared under mild reaction conditions from aromatic, heteroaromatic, and aliphatic alkynyl indoles with complete
Silver-Catalyzed Carbon Dioxide Fixation on Alkynylindoles
作者:Seiya Uema、Kodai Saito、Tohru Yamada
DOI:10.1021/acs.orglett.2c01994
日期:2022.7.8
A silver-catalyzed carbondioxidefixation reaction into 2-alkynylindole derivatives was developed to afford tricyclic indoles. Carbondioxide was selectively fixed on the N atom of the indole, and only 6-endo-dig cyclization proceeded under mild reaction conditions. Carboxylation on C3 of the indole was not observed. This method was applicable for a variety of 2-alkynylindoles, and the corresponding
Exploring the catalytic role of the guanidine TBD in carboxylative cyclizations
作者:Kaitlin A. Isfeld、Charles Killeen、Dawson J. Konowalchuk、Rebecca L. Davis
DOI:10.1039/d2ob01012g
日期:——
Employing a combination of mechanistic, kinetic and computational studies we have examined the mechanism of the TBD-catalyzed carboxylative cyclization of indole derivatives. Our studies provide insight into the role of the guanidine superbase TBD in catalyzing C–C bond formationbetweenindole derivatives and CO2.
通过结合机械、动力学和计算研究,我们研究了 TBD 催化的吲哚衍生物羧化环化的机制。我们的研究提供了对胍超碱 TBD 在催化吲哚衍生物和 CO 2之间形成 C-C 键中的作用的见解。