Abstract
Acetylene in the KOH / DMSO system (1 bar, 140 °C, 12 h) is annulated with 3-methyl-7,8-dihydrocinnolin-5(6H)-one oxime in several directions: along with the building up of pyrrole fragment over cyclohexane ring, transformation of the oxime function to the amino one occurs. This amine undergoes other annulations to form tricyclic compounds with pyridine moieties.
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