Electrophilic addition of phenols to 1-vinyl-4,5,6,7-tetrahydroindole
Both uncatalyzed and acid-catalyzed (CH3COOH) addition of phenols to 1-vinyl-4,5,6,7-tetrahydroindole gave 1-(1-aroxyethyl)-4,5,6,7-tetrahydroindoles. With increasing acidity of the phenol and in the presence of CF3COOH the yield of adducts was lowered because of the oligomerization of 1-vinyl-4,5,6,7-tetrahydroindole.