Some novel heterocycles from deoxygenation of indole o-nitrophenyl sulphides
Abstract
With triethyl phosphite, the indolyl o-nitrophenyl sulphides (1), (2) and (3) gave, among other products, the dihydrobenzothiazepine (4), and the indolobenzothiazines (7) and (9), respectively, while the o-nitrophenylindoles (10) and (11) gave the isomeric indoloindoles (12) and (13); compounds (9) changes rapidly into the spiro-oxindole (8).