Abstract
Reaction of ethyl 5-amino-4-(substituted amino) -2-methylthiothieno[2, 3-dlpyrimidne-6-carboarytates with formaldehyde in the presence of hydrochloric acid resulted in the synthesis of the corresponding ethyl 3, 4-dihydro-7-methylthio-5H-1-thia-3, 5, 6, 8-tetraazaacenaphthylene-2-carboxylates, which are examples of anew heterocyclic system.
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Tumkyavichyus, S. Synthesis of 3,4-Dihydro-5H-1-Thia-3,5,6,8-tetraazaacenaphthylenes. Chem Heterocycl Compd 32, 93–95 (1996). https://doi.org/10.1007/BF01169362
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DOI: https://doi.org/10.1007/BF01169362