analogues of chromones and coumarins with potential biological activities, were synthesized in good yields through sequential base-catalyzed intramolecular cyclization of O-alkyl-O'-(2'-methoxycarbonyl phenyl)-(substituted) benzyl phosphonates and alkylation. The synthesis sets the stage for an examination of the biological activities.
[structure: see text] We have developed a general and efficient approach to a diverse series of phosphacoumarins as analogues of coumarins with various biologicalactivities, and the inhibitory activity of the synthesized phosphacoumarins against the enzyme SHP-1, a protein tyrosine phosphatases, was tested. Some of them showed moderate to good efficiency.