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Synthesis of a new 2-aryl-4Н-naphtho[2’,3’,4,5]thieno[2,3-d][1,3]oxazine-4,5,10-triones, 2-arylnaphtho[2’,3’,4,5]thieno[2,3-d][1,3]pyrimidine-4,5,10(3Н)-triones, 3-phenyl naphtho[2’,3’,4,5]thieno[2,3-d][1,3]pyrimidine-2,4,5,10(1Н, 3Н)-tetraone and 2-thioxo-2,3-dyhydronaphth[2’,3’,4,5]thieno[2,3-d]pyrimidine-4,5,10(1Н)-trione was carried out. The mechanism of 2-aryl-4Н-naphtho[2’,3’,4,5]thieno[2,3-d][1,3]oxazine-4,5,10-triones formation was suggested.

Synthesis of condensed S-, N- containing heterocyclic systems on the base of 2-amino-4,9-dioxo-4,9-dihydronaphto[2,3-b]thiophene-3-ethylcarboxilate