title: Synthesis and Bronchodilator Studies of Some Novel 6-Alkyl/Aryl-1,2,4-Triazino[4,3-c]Quinazolines.
abstract: A series of alkyl- and aryl-1,2,4-triazino[4,3-c]quinazolines (5a-h and 8a-h) were synthesized and characterized. The title compounds were evaluated for their in vivo bronchodilator activity on guinea pigs. All the test compounds exhibited good protection against histamine-induced bronchospasm. The structure-activity relationships based on the results obtained for these series were studied. Incorporation of an aryl ring with halo substitution to the theophylline bioisostere increases its potency. Among the compounds tested, 5b was found to be the most potent with 88.7% protection against histamine-induced bronchospasm compared to the standard compound aminophylline (87.8%).
authors: Medicinal Chemistry Research Division, University College of Pharmaceutical Sciences, Kakatiya University, Warangal, AP-506 009, India.
authors: Rajan Subramanian
authors: RS
authors: Kombu
authors: Raghu Prasad
authors: RP
authors: Mailavaram
authors: Harikrishna
authors: H
authors: Devalapally
authors: Prabhakar Marsanapalli
authors: PM
authors: Chinnappa
authors: Rama Krishna
authors: RK
authors: Devarakonda
authors: Raghu Ram Rao
authors: RR
authors: Akkinepally