作者:Oscar R. Suárez-Castillo、Ana L. Morales-García、Indira C. Cano-Escudero、Yaneth M. A. Contreras-Martínez、Myriam Meléndez-Rodríguez、Martha S. Morales-Ríos、Pedro Joseph-Nathan
DOI:10.3987/com-08-11627
日期:——
An improved synthesis of N1-carbomethoxylated indolylindolines 2 from 5-substituted indoles 1, by replacing the previously employed strong acids or toxic metals with t-BuNH2/MeOCOCl in CH2Cl2/H2O, is described. The substituent effect of electron donor or acceptor groups was examined, revealing that electron-deficient indoles are less reactive to dimerization than electron-rich indoles, with 5-cyano and 5-nitroindoles leading to no reaction. A dynamic process caused by the restricted rotation of the N-CO2Me bond of 2 was evidenced by H-1 NMR measurements.