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The Diels‐Alder reactions of ethyl α‐bromoacrylate 1 with open‐chain dienes 2 were conducted under thermal or Lewis acid‐catalysis conditions. In most cases, the cyclic adducts of 1‐bromocyclohex‐3‐enecarboxylates 3 were formed in high yields with good regio‐ and stereoselectivity. Subsequent E2‐elimination by treatment with DBU provided the corresponding 1,3‐ or 1,4‐cyclohexadienecarboxylates depending...
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