2,5-Dimethylindolo[3,2-b]pyridines and polymethine dyes based on them

Alkylation at the nitrogen atom of the pyrrole ring of 2-methylindolo[3,2-b]-pyridine was studied, and new 2,5-dimethyl-8-R-indolo[3,2-b]pyridines (R=H, Br) were synthesized. The ethiodides of these compounds and their 2--acetanilinovinyl derivatives, in the condensation of which in DMSO in the presence of potassium tert-butoxide symmetrical carbocyanines were synthesized, were obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 391–395, March, 1990.