Studies in Quinazoline Chemistry. 3. Synthesis of 2-(2-Pyridon-3-yl)- and 2-[Thieno[2,3-<Emphasis Type="Italic">b</Emphasis>]pyridin-2(3)-yl]-3,4-dihydroquinazolines

We have studied the reaction of o-aminophenyldiphenylcarbinol with substituted cyanothienopyridine, cyanopyridines, cyanopyridones, and cyanopyridinethiones. We have shown that in the case of pyridine derivatives, the reaction occurs with formation of 3,4-dihydroquinazolines, which exist in solution in two tautomeric forms. We have determined the general characteristics of initial fragmentation of the indicated products under electron impact. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1222–1229, August, 2005.