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Paper | Regular issue | Vol 24, No. 7, 1986, pp.1899-1909
Published online, 1st January, 1970
DOI: 10.3987/R-1986-07-1899
Transformation of 2,4,5-Trisubstituted Pyrimidines. The Syntheses and Transformations of Pyrimido[4,5-d]pyrimidine, 1,2,4-Triazolo[4,3-a]pyrimidine, Tetrazolo[1,5-a]pyrimidine, 1,2,4-Triazolo[3,4-b]purine and Tetrazolo[5,1-b]purine Derivatives

Uros Urleb, Branko Stanovnik,* Vekoslava Stibilj, and Miha Tisler

*Department of Chemistry, E. Kardelj University, Murnikova 6, 61000 Ljubljana, Slovenia

Abstract

Some new approaches for the syntheses of pyrimido-[4,5-d]pyrimidines 3, 4, 9, and 10,5,6-disubstituted 1,2,4- triazolo[4,3-a]pyrimidines 13,15,16,17,19, and 20,5,6-disubstituted tetrazolo[5,1-a]pyrimidine 21,1,2,4-triazolo[3,4-b]purine 27 from 2,4,5-trisubstituted pyrimidines 2 and 12 are described.