Add time:09/28/2019         Source:sciencedirect.com

A novel class of 1′-cyclobutyl-6-(4-piperidyloxy)spiro[benzopyran-2,4′-piperidine] derivatives with low nanomolar affinity for the human and rat histamine-3 receptors (H3Rs) are described. The spirobenzopyran piperidine ether analogs demonstrated excellent H3R affinity and selectivity against histamine receptor subtypes (H1R, H2R, and H4R), were stable in liver microsomes, and had selectivity against CYP P450 enzymes. Compounds 10, 13, 15, and 16 demonstrated high H3R affinity, in vitro liver microsomal stability, selectivity against CYP isoforms, moreover, these ether analogs exhibited acceptable iv pharmacokinetic (PK) properties but had poor oral exposure in rat.

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