Abstract
AbstractN‐Aminophenanthridinium salt reacted with dimethyl acetylenedicarboxylate in the presence of potassium carbonate to give a 3,3a‐dihydropyrazolo[1,5‐f]phenanthridine but with mono‐substituted acetylenes (ethyl propiolate and benzoylacetylene) it produced aromatized pyrazolo‐[1,5‐f]phenanthridines (XII and XIII). The reaction of the N‐benzoylimine with di‐substituted acetylenes (dimethyl acetylenedicarboxylate and methyl phenylpropiolate) and mono‐substituted acetylenes (ethyl propiolate and benzoylacetylene) yielded 1,3a‐dihydropyrazolo[1,5‐f]phenanthridines and the aromatized products (XII and XIII), respectively.
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