We describe a novel and simple method for the regiospecific synthesis of functionalized
trifluoromethyl- and perfluoroalkyl-containing 4H-chromen-4-ones via the cyclization of substituted 3-aryloxy-3-perfluoroalkylpropenoic
acids. The procedures give the final products in high yields, without any need for
chromatographic purification, and no side products.
aldehydes - oxidations - carboxylic acids - regioselectivity - heterocycles