Document Report Card

ID: ALA1124636

Journal: J Med Chem

Title: 3,4-Dihydro-2H-1-benzopyran-2-carboxylic acids and related compounds as leukotriene antagonists.

Authors: Cohen N, Weber G, Banner BL, Lopresti RJ, Schaer B, Focella A, Zenchoff GB, Chiu AM, Todaro L, O'Donnell M.

Abstract: Evaluation of a series of 3,4-dihydro-2H-1-benzopyran-2-carboxylic acids linked to the 2-hydroxyacetophenone pharmacophore present in the standard peptidoleukotriene antogonist FPL 55712 (1) has led to the discovery of Ro 23-3544 (7), an antagonist possessing greater potency and duration of action vs LTD4 than the standard (aerosol route of administration, guinea pig bronchoconstriction model). Interestingly, this compound also potently inhibited bronchoconstriction induced by LTB4 whereas 1 did not. Attempts to establish structure--activity relationships in this series involved modifications in the 2-hydroxyacetophenone moiety, the linking chain, and the chroman system. All variations produced analogues which were either inactive or possessed reduced potency relative to acid 7. Optical resolution of 7 was achieved by two methods. Absolute configurations of the enantiomers were determined via X-ray crystallographic analyses of an intermediate as well as a salt of the S enantiomer. Although the enantiomers exhibited similar potencies in in vitro assays and in vivo when administered intravenously, significant differences were observed in the guinea pig bronchoconstriction model vs LTC4 and LTD4 when administered by the aerosol route (S antipode 15-fold more potent). The properties of 7 have been compared with several recently reported leukotriene antagonists.

CiteXplore: 2547071

DOI: 10.1021/jm00128a028