altholactone (1) led to the corresponding O-methoxymethyl derivative (3) in addition to the unexpected 6,7-dihydro-7-methoxy analogue (4), and two original tetrahydrofuranic (THF) alkyl esters ( 5,6). Moreover, when we accomplished a new method for the preparation of the furano-pyrone goniofupyrone (7) through 7-hydroxylation of 1 in acid medium, a minor compound (8) with an identical skeleton to that of compounds