Synthesis of chromenoimidazocarbolines by a reaction of quaternary iminium salts with o-hydroxybenzaldehydes

[Figure not available: see fulltext.] It was shown that the interaction of N2-(cyanomethyl)-β-carbolinium bromide with o-hydroxybenzaldehydes in the presence of ammonium acetate upon refluxing in ethanol proceeded as a domino reaction and led to the formation of chromenoimidazocarbolines. © 2017, Springer Science+Business Media, LLC.