Synthesis of chromones by cyclization of 2-hydroxyphenyl ketones with boron trifluoride–diethyl ether and methanesulphonyl chloride
Abstract
2-Hydroxyphenyl arylalkyl and alkyl ketones have been cyclised in high yield to the corresponding isoflavones and chromones by treatment with BF3–Et2O and MeSO2Cl in HCONMe2.