Abstract
Treatment of (E)-3-(2-hydroxypropylidene)-4-methyl-1-phenylazetidin-2-one (11) with 10% Pd/C gave (E)-(12), (Z)-3-(2-oxopropylidene)-4-methyl-1-phenylazetidin-2-one (13), 3,4-cis-(14a) and 3,4-trans-3-(2-oxopropyl)-4-methyl-1-phenylazetidin-2-one (14b). Among them, 12 and 13 were found to show potent inhibitory activities against rabbit platelet-rich plasma aggregation induced by adenosine diphosphate or collagen. Ring-expanded homologous derivatives and an acyclic analogue of 12 were also synthesized and tested for the biological activities. The azetidin-2-one skeleton bearing a 2-oxoalkylidene moiety at the 3 position was found to be essential for the platelet aggregation inhibitory activities of these compounds.
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