Abstract:
:A series of novel 1-substituted-4-(2-methylphenyl)-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-ones were synthesized by the cyclization of 2-hydrazino-3-(2-methylphenyl)-3H-quinazolin-4-one with various one carbon donors. The starting material 2-hydrazino-3-(2-methylphenyl)-3H-quinazolin-4-one was synthesized from 2-methyl aniline by a novel innovative route. The title compounds were tested for their in vivo H(1)-antihistaminic activity on guinea pigs; all the tested compounds protected the animals from histamine-induced bronchospasm significantly. Compound 1-methyl-4-(2-methylphenyl)-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-one (II) emerged as the most active compound of the series and it is more potent (72.45%) when compared to the reference standard chlorpheniramine maleate (71%). Compound II showed negligible sedation (11%) when compared to chlorpheniramine maleate (30%). Hence it could serve as the prototype molecule for further development as a new class of H(1)-antihistaminic agents.
journal_name
Eur J Med Chemjournal_title
European journal of medicinal chemistryauthors
Alagarsamy V,Rupeshkumar M,Kavitha K,Meena S,Shankar D,Siddiqui AA,Rajesh Rdoi
10.1016/j.ejmech.2007.10.001subject
Has Abstractpub_date
2008-11-01 00:00:00pages
2331-7issue
11eissn
0223-5234issn
1768-3254pii
S0223-5234(07)00383-2journal_volume
43pub_type
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