Oxidations of 3-alkenyltetronic acids with dimethyldioxirane (DMD) and air: regioselectivity and formation of a spirotricyclic hemiketal endoperoxidelactone
R. Schobert et al., Oxidations of 3-alkenyltetronic acids with dimethyldioxirane (DMD) and air: regioselectivity and formation of a spirotricyclic hemiketal endoperoxidelactone, J CHEM S P1, (17), 2001, pp. 2009-2011
The endocyclic C=C bond of 3-allyltetronic acid 1 can be selectively oxidis
ed with dimethyldioxirane to give 3-allyl-3-hydroxydihydrofuran-2,4-dione 2
while 3-exo-alkylidenedihydrofuran-2,4-diones 9 are rapidly autooxidised t
o furnish the spirotricyclic hemiketal endoperoxide lactones 10.