Double Diels–Alder reactions of coumalic acid with buta-1,3-dienes: a single-step synthesis of tricyclo[3,2,1,02,7]oct-3-ene derivatives

Abstract
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.

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