title: Design, synthesis, and docking studies of novel benzopyrone derivatives as H(1)-antihistaminic agents.
abstract: Two new series of 2H-1-benzopyran-2-one derivatives substituted at C-6 and/or C-7 with propanolamines, and/or piperazine propanol derivatives have been synthesized and assayed for the H(1)-histamine antagonist. Twelve of the 20 newly synthesized 4- substituted benzopyrones have shown potent antihistaminic H(1) activity. In addition, molecular modeling and docking of the tested compounds into high affinity histamine binding protein (HBP) and histamine N-methyltranseferase (HNMT) active site in complex with its bound inhibitor (diphenhydramine) was performed in order to predict the affinity and orientation of these compounds at the active sites. The ICM score values show good agreement with predicted binding affinities obtained by molecular docking studies as verified by pharmacological screening. The results showed similar orientation of the target compounds at HBP, and HNMT active sites compared with reported histamine H(1) antagonist. Also, it was concluded that in order for the compounds to be active, they must bind with both active sites of HNMT enzyme (two pockets) to inhibit it. Compounds 8c, 8i, 11g, 11i, and 11k; observe the maximum activities.
authors.affiliation: Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University, El-Kasr El-Aini Street, Cairo 11562, Egypt. anahla_69@yahoo.com
authors.forename: Nahla A
authors.initials: NA
authors.lastname: Farag
authors.forename: Shadia R
authors.initials: SR
authors.lastname: Mohamed
authors.forename: Gamal A H
authors.initials: GA
authors.lastname: Soliman
mesh_terms: D000465:Algorithms; D000818:Animals; D001665:Binding Sites; D003374:Coumarins / Q000138:chemical synthesis / Q000494:pharmacology*; D015195:Drug Design; D006168:Guinea Pigs; D006632:Histamine / Q000378:metabolism; D006633:Histamine Antagonists / Q000378:metabolism; D006634:Histamine H1 Antagonists / Q000138:chemical synthesis / Q000494:pharmacology*; D006637:Histamine N-Methyltransferase / Q000378:metabolism; D008297:Male; D013329:Structure-Activity Relationship
chemical_list: D003374:Coumarins; D006633:Histamine Antagonists; D006634:Histamine H1 Antagonists; D006632:Histamine; C030123:coumarin; D006637:Histamine N-Methyltransferase