Synthesis of enantiopure Delta2-isoxazoline derivatives and evaluation of their affinity and efficacy profiles at human beta-adrenergic receptor subtypes

Bioorganic & Medicinal Chemistry
C DallanoceCarlo De Micheli

Abstract

The new enantiomerically pure 3-substituted-Delta(2)-isoxazolin-5-yl-ethanolamines (+)-6a/(-)-6b, (-)-6a/(+)-6b, and (+)-7a/(-)-7b, prepared via a 1,3-dipolar cycloaddition-based approach, were tested for their affinity at human beta(1)-, beta(2)-, and beta(3)-adrenergic receptor (beta-AR) subtypes stably expressed in CHO cells. The corresponding 3-isopropenyl derivatives (+)-5a/(-)-5b, (-)-5a/(+)-5b, and some isoxazole analogs were also tested. The binding affinities at the beta-ARs of the isoxazolinyl amino alcohols were significantly lower than those of the corresponding isoxazole derivatives. A stereochemical effect was observed, since the process of molecular recognition is predominantly controlled by the (S)-configuration of the stereogenic center located at the 5 position of the heterocycle rather than by that of the stereocenter carrying the secondary alcohol group. On the contrary, the stereochemical features marginally affected the efficacy response; as a matter of fact, functional tests carried out on Delta(2)-isoxazoline derivatives provided with a detectable binding affinity showed the overall profile of neutral antagonists at all three beta-AR subtypes.

References

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Nov 1, 1987·Proceedings of the National Academy of Sciences of the United States of America·T FrielleB K Kobilka
Jan 28, 2004·Annual Review of Pharmacology and Toxicology·Jacques RobidouxSheila Collins
May 6, 2004·Seminars in Cell & Developmental Biology·Randy A Hall

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