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Hydrogenated γ-carbolines underwent tandem piperidine ring cleavage on treatment with dimethyl acetylenedicarboxylate (DMAD) or ethyl propiolate (EP) in the presence of alcohols, producing 3-alkoxymethyl-substituted indoles in high yields. These compounds were cyclized to tetrahydroazocino [4,5-b]indoles in the presence of AlCl 3 . Hydrogenated β-carbolines produced tetrahydroazocino [5,4-b]indoles directly upon treatment with EP in ethanol. The resulting azocinoin-

No abstract

The thermolysis reactions of benzoazacyclodecatrienes under microwave irradiation conditions in toluene at 150 °C afforded complex azabenzo[a]cyclopropa[cd]azulene and (epiminomethano)cyclopenta[a]indene frameworks. Cyclopropanes were established as intermediates of the ultimate thermolysis products.

Benzazecines with an allene fragment were prepared for the first time and in high yields via tandem reaction of 1-phenylethynyl-1-methyl(benzyl)-1,2,3,4-tetrahydroisoquinolines with activated alkynes in trifluoroethanol.