SCHEDULED MAINTENANCE
Fourteen 2,3-cycloalkeno-chromones and -thiochromones (4H-benzo[b]thiapyrones) have been prepared by a new method in which enamines of cyclic ketones are condensed with the mixed anhydrides formed from ethylchloroformate and acetylsalicylic acids and their thio-analogues. An acyl migration occurs in the reactions of 2-pyrrolidinopropene to give 3-acyl-2-methylchromones.
G. V. Boyd, D. Hewson and R. A. Newberry, J. Chem. Soc. C, 1969, 935 DOI: 10.1039/J39690000935
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