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The selenious acid oxidation of 2‐aryl‐7,7‐dimethyl‐5,6,7,8‐tetrahydro‐5‐quinazolones 2a–c leads to the corresponding 2‐aryl‐7,7‐dimethyl‐6,8‐epidiseleno‐5,6,7,8‐tetrahydro‐5‐quinazolones 3a–c. This is the first observation of the formation of an intramolecular unsymmetrical diselenide by selenious acid oxidation and reports the first derivatives of the new ring system 2,3‐diselenabicyclo[3.2.1]octane.

Fused pyrimidine derivativesFused pyrimidine derivatives R 0515 Pyrimido[4,5-f]quinazolines. -Ongoing research leads to the synthesis of a novel set of the title compounds such as (V). -(TONKIKH, N. N.; STRAKOVS, A.; PETROVA, M. V.; Chem. Heterocycl.