THREE NEW 5,6-DIHYDRO-α-PYRONES ISOLATED FROM CRYPTOCARYA NITENS

Three new 5,6-dihydro-alpha-pyrone derivatives, named cryptonitenones A-C (1-3), were isolated from the leaves of Cryptocarya nitens Koord. & Valeton. Their absolute structures were determined by means of the NMR and CD spectroscopic analyses. In addition, their deacetyl precursor, cryptomoscatone E3, was obtained from the twigs of the plant.