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Aroylketenes generated by thermolysis of 6-aryl-2,2-dimethyl-4H-1,3-dioxin-4-ones react with ( Z)-2-[3,3-dimethyl-3,4-dihydroisoquinolin-1(2 H)-ylidene]acetamides and (Z)-2-[4amethyl-1,3,4,4a,5,10b-hexahydrophenanthridin-6(2 H)-ylidene]acetamide to produce (Z)-4aryl-3-(3,3-dimethyl-3,4-dihydroisoquinolin-1(2 H)-ylidene)pyridine-2,6(1 H,3 H)-diones and (Z)-3-(4a-methyl-1,3,4,4a,5,10b-hexahydrophenanthridin-6(2 H)-ylidene)-4-phenylpyridine2,6(1 H,3 H)-dione. The crystal and molecular structure of ( Z)-3-(4a-methyl-1,3,4,4a,5,10bhexahydrophenanthridin-6(2 H)-ylidene)-4-phenylpyridine-2,6(1 H,3 H)-dione was confirmed by X-ray analysis.

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Direct heterocyclization of [3,4-dihydroisoquinolin-1(2H)-ylidene]acetamides with aroylketenes. Crystal and molecular structure of (Z)-3-(4a-methyl-1,3,4,4a,5,10b-hexahydrophenanthridin-6(2H)-ylidene)-4-phenylpyridine-2,6(1H,3H)-dione