Kahweofuran 1, one of the impact flavours of roasted coffee, was obtained from the acyclic unsaturated ester 8, produced in a Stobbe condensation of α-methylcinnamaldehyde with dimethyl succinate, through the key intermediate tetrahydrothiophene 14 and the C-7 derivatives 20 or 24, respectively.
E. Brenna, C. Fuganti, S. Serra and A. Dulio, J. Chem. Res. (S), 1998, 74 DOI: 10.1039/A706334B
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