The N-methyl (XVII) and N-dimethylallyl (XVIII) derivatives of the title compound (XVI) have been synthesised from 3,4-dihydro-1-methylnaphthalen-2(1H)-one (II). The thermal rearrangement of (2,2-ethylenedioxy-1,2,3,4-tetrahydro-1-methyl-1-naphthyl)acetic acid (IV) to 3a,4,5,9b-tetrahydro-3a-(2-hydroxyethoxy)-9b-methylnaphtho[2,1-b]furan-2(1H)-one (IX) was encountered during this work.
N. J. Harper and J. Raines, J. Chem. Soc. C, 1969, 1372 DOI: 10.1039/J39690001372
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