title: Synthesis of new pyrido[4',3':4,5]thieno[2,3-d]-1,2,4-triazolo[3,4-c]pyrimidines and a 5,6-dihydro-1,2,4-triazolo[4",3":1',2']pyrido[4',3':4,5]thieno [2,3-d]-pyrimidine ring system.
abstract: A series of substituted pyrido[4',3':4,5]thieno[2,3-d]-1,2,4-triazolo[3,4-c]pyrimidines 4-6, 8, pyrido[4',3':4,5]thieno[2,3-d]-1,2,4-triazolo[3,4-c]pyrimidines 11-13 and 5,6-dihydro-1,2,4-triazolo[4",3":1',2']pyrido[4',3':4,5]thieno[2,3-d] pyrimidines 16-19 have been synthesized from 3, 10 and 15 through the reaction with orthoesters and carbon disulphide, respectively.
authors.affiliation: Department of Chemistry, Faculty of Science, El-Minia University, A. R. Egypt.
authors.forename: E K
authors.initials: EK
authors.lastname: Ahmed
authors.forename: A M
authors.initials: AM
authors.lastname: Gohar
authors.forename: M A
authors.initials: MA
authors.lastname: Ameen
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000737:chemistry; D014230:Triazoles / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D011743:Pyrimidines; D014230:Triazoles