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  • Title: Nitrogen bridgehead compounds. 18. New antiallergic 4H-pyrido[1,2-a]pyrimidin-4-ones. 1.
    Author: Hermecz I, Breining T, Mészáros Z, Horváth A, Vasvári-Debreczy L, Dessy F, DeVos C, Rodriguez L.
    Journal: J Med Chem; 1982 Oct; 25(10):1140-5. PubMed ID: 6183427.
    Abstract:
    A new type of antiallergic agent, 9-hydrazono-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-ones, was synthesized and evaluated for inhibitory effects in the rat reagenic passive cutaneous anaphylaxis (PCA) screen. Several racemic 6-methyl derivatives were found to be more potent than disodium chromoglycate intravenously and some were also active orally. Structure-activity relationships are discussed. High stereospecificity was observed in the 6-methyl series between the enantiomers with 6S and 6R absolute configuration, the former being more active. Compound 17, (+)-6(S)-methyl-9-(phenylhydrazono)-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid [Chinoin-1045; UCB L140], has an ED50 value of 1.0 mumol/kg po and is now under clinical investigation.
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