Potent Nonpeptide Antagonists of the Bradykinin B1 Receptor:  Structure−Activity Relationship Studies with Novel Diaminochroman Carboxamides

• Published in: Journal of medicinal chemistry 2007-05, Vol.50 (9), p.2200-2212
• Main Authors: Biswas, Kaustav, Li, Aiwen, Chen, Jian Jeffrey, D'Amico, Derin C, Fotsch, Christopher, Han, Nianhe, Human, Jason, Liu, Qingyian, Norman, Mark H, Riahi, Bobby, Yuan, Chester, Suzuki, Hideo, Mareska, David A, Zhan, James, Clarke, David E, Toro, Andras, Groneberg, Robert D, Burgess, Laurence E, Lester-Zeiner, Dianna, Biddlecome, Gloria, Manning, Barton H, Arik, Leyla, Dong, Hong, Huang, Ming, Kamassah, Augustus, Loeloff, Richard, Sun, Hong, Hsieh, Feng-Yin, Kumar, Gondi, Ng, Gordon Y, Hungate, Randall W, Askew, Benny C, Johnson, Eileen
• Format: Article
• Language: English
• Subjects: Amides - chemical synthesis; Amides - pharmacokinetics; Amides - pharmacology; Analgesics - chemical synthesis; Analgesics - pharmacokinetics; Analgesics - pharmacology; Animals; Benzopyrans - chemical synthesis; Benzopyrans - pharmacokinetics; Benzopyrans - pharmacology; Biological and medical sciences; Blood Pressure - drug effects; Bradykinin B1 Receptor Antagonists; Calcium - metabolism; CHO Cells; Chromans - chemical synthesis; Chromans - pharmacokinetics; Chromans - pharmacology; Cricetinae; Cricetulus; Humans; In Vitro Techniques; Inflammation - drug therapy; Male; Medical sciences; Microsomes - metabolism; Neuropharmacology; Neurotransmitters. Neurotransmission. Receptors; Pain - drug therapy; Peptidergic system (neuropeptide, opioid peptide, opiates...). Adenosinergic and purinergic systems; Pharmacology. Drug treatments; Rabbits; Rats; Rats, Sprague-Dawley; Receptor, Bradykinin B1 - agonists; Stereoisomerism; Structure-Activity Relationship; Sulfonamides - chemical synthesis; Sulfonamides - pharmacokinetics; Sulfonamides - pharmacology
• ISSN: 0022-2623; 1520-4804
• DOI: 10.1021/jm070055c

The bradykinin B1 receptor is induced following tissue injury and/or inflammation. Antagonists of this receptor have been studied as promising candidates for treatment of chronic pain. We have identified aryl sulfonamides containing a chiral chroman diamine moiety that are potent antagonists of the human B1 receptor. Our previously communicated lead, compound 2, served as a proof-of-concept molecule, but suffered from poor pharmacokinetic properties. With guidance from metabolic profiling, we performed structure−activity relationship studies and have identified potent analogs of 2. Variation of the sulfonamide moiety revealed a preference for 3- and 3,4-disubstituted aryl sulfonamides, while bulky secondary and tertiary amines were preferred at the benzylic amine position for potency at the B1 receptor. Modifying the β-amino acid core of the molecule lead to the discovery of highly potent compounds with improved in vitro pharmacokinetic properties. The most potent analog at the human receptor, compound 38, was also active in a rabbit B1 receptor cellular assay. Furthermore, compound 38 displayed in vivo activity in two rabbit models, a pharmacodynamic model with a blood pressure readout and an efficacy model of inflammatory pain.