Abstract
C-(4-Oxo-4 H[1]benzopyran-3-yl)- N-phenylnitrones ( 1a-c) undergo facile rearrangements on refluxing in benzene, yielding 2-( N-phenylamino)-4-oxo-4 H[1]-benzopyran-3-carboxaldehydes ( 2a-c, 70%) and 3-(phenyliminomethylene)-chroman-2,4-diones ( 3a-c, 25%). 2a-c undergo cyclization on refluxing with anhydrous AlCl 3 in dry CCl 4 followed by treatment with sulfuric acid, to give novel quinolino[2,3- b]chroman-12-ones( 4a-c) in 90% yield.
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