B. Kongkathip et al., Syntheses of both diastereoisomers of 2,8-dioxabicyclo[3.2.1]octane derivatives: Degradation products of daphniphyllum alkaloids, CHEM LETT, (10), 1999, pp. 1095-1096
Both diastereoisomers of 1,4-dimethyl-2,8-dioxabicyclo[3.2.1]. octane-4-cab
oxylic acid ester (3, 4) and the 4-hydroxy methyl analogaes (5, 6) were syn
thesised from ethyl acetoacetate and diethyl malonate respectively. The key
step of these process involved intramolecular cyclisation using palladium
chloride as catalyst.