Abstract
The reactivity of 4-hydroxy-1-methyl-3-[(2-oxo-2H-chromen-3-yl)carbonyl]-quinolin-2(1H)-one (2), as a new asymmetric diheterocyclic ketone, towards different nucleophilic reagents, was examined. The reaction of the ketone 2 with hydrazine led to pyrazolinone 5, and excess of hydrazine pyrazolinopyrazole 7 was obtained. Treatment of the ketone 2 with 2,2-dimethoxyethanamine gave pyrrolocoumarin 12, while cyanoguanidine afforded pyrimidinone 15. Under PTC conditions, the ketone 2 was reacted with chloroacetonitrile, diethyl malonate, ethyl cyanoacetate, malononitrile, and cyanoacetamide to give coumarinyl furoquinoline 18, pyranoquinolines 20a, 20b, 21, and benzonaphthyridine 22, respectively. The reaction of 3-[(chromon-3-yl)carbonyl]quinolin-2-one 2 towards nucleophiles, such as; hydrazine, 2,2-dimethoxyethanamine, cyanoguanidine, chloroacetonitrile, diethyl malonate, ethyl cyanoacetate, malononitrile, and cyanoacetamide was described leading to pyrazolines 5 and 7. pyrrolocoumarin 12, pyrimidinone 15, coumarinylfuroquinoline 18, pyranoquinolines 20–21, and benzonaphthyridine 22, respectively.
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