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Paper | Regular issue | Vol 55, No. 1, 2001, pp.115-125
Published online, 1st January, 1970
DOI: 10.3987/COM-00-9069
Synthesis and Transformations of Pyrido[4,3-d]pyrimidines with N-Heterocycles Moieties

A. Z. M. Shaifullah Chowdhury* and Yasuyuki Shibata

*Environmental Chemistry Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-0053, Japan


ortho-Amino ester (1) was cyclized to fused pyrimidines by reacting with isocyanate, isothiocyanate, or dithioketal reagent. Thioxo compound (2a) was halogenated, methylated and subsequently displaced by amines. ortho-Amino ester (1) was also converted into directly tricyclic azolopyrido[4,3-d]pyrimidines (8-13).