Reaction of coumalic acid with buta-1,3-dienes gave (IIIa–c)via double Diels–Alder reaction; this represents the simplest synthesis of the tricyclo[3,2,1,02,7]oct-3-ene ring system.
T. Imagawa, M. Kawanisi and K. Sisido, J. Chem. Soc. D, 1971, 1292 DOI: 10.1039/C29710001292
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