92264-37-4Relevant articles and documents
Chameleon-like Behavior of the Directing Group in the Rh(III)-Catalyzed Regioselective C-H Amidation of Indole: An Experimental and Computational Study
Zhang, Jinquan,Xie, Hujun,Zhu, Huajian,Zhang, Shuaizhong,Reddy Lonka, Madhava,Zou, Hongbin
, p. 10233 - 10244 (2019/10/28)
The Rh(III)-catalyzed regioselective C-H amidation of N-methoxy-1H-indole-1-carboxamides by 1,4,2-dioxazol-5-ones was studied. N-Methoxy amide, the directing group (DG) of interest, undergoes four different transformations through DG-retained, -coupled, -eliminated, or -migrated processes under moderately varied reaction conditions. Solvents, additives, and temperature play important roles in these selective transformations; a trace addition of water favors the functional group (FG)-assisted DG elimination; extra addition of KHSO4 greatly enhances the formation of the DG-coupled product; high-temperature and proper FG together can shift the position of DG through intermolecular Friedel-Crafts-like acylation. The catalytic mechanisms underlying these reactions were further investigated through density functional theory calculations and experimental studies including the characterization of amido-inserted rhodacycle. An overall catalytic pathway was proposed to illustrate the reactions involved in the regioselective amidation of N-methoxy-1H-indole-1-carboxamide.
Reductive Formation of 2-(Benzoylamino)indole from 3-(2-Aminobenzyl)-5-phenyl-1,2,4-oxadiazole and Its Transfomation to 6-Phenyl-8H-pyrimido-diindole, a New Heterocyclic Ring System
Bata, Imre,Korbonits, Dezsoe,Kolonits, Pal,Podanyi, Benjamin,Takacsy-Eroes, Tuende,Simon, Kalman
, p. 1835 - 1842 (2007/10/02)
Catalytic hydrogenation of 5-substituted 3-(2-aminobenzyl)-1,2,4-oxadiazoles 7 give 2-(acylamino)indoles 10.Treatment of 2-(benzoylamino)indoles 10a-c with acid leads to the novel 6-phenyl-8H-pyrimidodiindoles 19a-c.A route for the new ring formation is proposed.Catalytic hydrogenation of 19a (Raney nickel, 70 deg C, atmospheric pressure) saturates the 6-phenyl ring but leaves the pentacyclic ring system intact.The structure of 19a is confirmed by an X-ray crystallographic analysis. - Key Words: 1,2,4-Oxadiazoles, 5-substituted, 3-(2-aminobenzyl)- / Indoles, 2-(acylamino)- / 8H-Pyrimidodiindoles, 6-aryl