| Abstract: | It is shown that the condensation of 2,3-dichloro-p-benzoquinone with N-alkyl(aryl)- -aminocrotonic acid esters leads, depending on the conditions and the nature of the substituent attached to the nitrogen of the aminocrotonic ester, either to substituted dichlorohydroquinones or to 5-hydroxy-6,7-dichloroindole derivatives. The latter are oxidized by nitric acid to the corresponding o-quinones.See [8] for communication XLIX.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 335–338, March, 1971 |
