インドール誘導体の研究(第7報) : 2-Oxo-4-methylthiopyrano-[2,3-b]-indole類のDiels-Alder反応

抄録

The Diels-Alder reaction of 4-methylthio-2-oxopyrano-[2, 3-b]-indoles with maleic anhydride, dimethyl acetylenedicarboxylate, and maleic anilide afforded carbazole derivatives (II to V) (cf. Table I). The reaction of one of these products, IV with ethanolamine, diethylaminoethylamine, and aminoacetal gave the imide derivatives (VI) (cf. Table II). The reaction of IVb and morpholine gave V which was also obtained by the reaction of the indole compound with maleic anhydride. The reaction of one of the products, II, with amines gave the same inide derivatives (VI), and that of IIb and ethanolamine gave the products (VII and VIII) formed by substitution of the methylthio group.