ABSTRACT4-Arylmethylene-2-phenyl-2-oxazolin-5-ones 1 a,b reacted with some active methylene reagents to afford pyrrolidine-3,5-dione, pywolo[2,3-b] Polyfunctionally substituted pyrrolones are interesting as potential pharmaceuticals [ 1-31 and intermediates in the dye industry [4]. In previous work, it has been reported that 4-phenylmethylene-2-oxazolin-5-one (lc) reacts with ethyl cyanoacetate (2a) in benzene in the presence of potassium metal to yield an acyclic p-ketoester, which could readily be cyclized to give an amino pyrrolone or pyrrolidine-3,5-dione, depending on the reaction conditions [ 5 ] . Attempted extension of this synthesis, utilizing benzoylacetonitrile (2b), afforded only products of a Michael addition across the double bond in 1 [5]. In continuation of our previous work [6,7], we report here results of our
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