Synthesis and structure of 3,7-dihydro-2H-1,2,4-triazolo-[1′,5′-a′]tripyrimido[4,5-d] benzo[b]pyrans

Article abstract of DOI:10.1007/BF01165451

The condensation of 5-(2-hydroxyphenyl)-6,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidines with aldehydes yields derivatives of a new heterocyclic system, namely, 3,7-dihydro-2H-1,2,4-triazolo[1′, 5′-a′]pyrimido[4,5-d]-benzo[b]pyran, including the 9-methyl-2,3-diphenyl derivative, whose structure was established by x-ray diffraction structural analysis. 1996 Plenum Publishing Corporation.