SYNTHETIC STUDIES ON FULLY SUBSTITUTED GAMMA-PYRONE-CONTAINING NATURAL-PRODUCTS - THE ABSOLUTE-CONFIGURATIONS OF ILIKONAPYRONE AND PERONIATRIOL-I AND PERONIATRIOL-II
Mild cyclization method [DMSO-(COCl)2 or Ph3P-CCl4] of triketides bearing optically active functional groups to the corresponding gamma-pyrones provided determination of the absolute configurations of ilikonapyrone and peroniatriols I and II isolated from the marine molluscs Onchidium verruculatum and Peronia peronii.