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À propos de : Palladium-Catalyzed SequentialAlkylation−Alkenylation Reactions.Application to the Synthesis of2-Substituted-4-Benzoxepines and2,5-Disubstituted-4-Benzoxepines        

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  • Palladium-Catalyzed SequentialAlkylation−Alkenylation Reactions.Application to the Synthesis of2-Substituted-4-Benzoxepines and2,5-Disubstituted-4-Benzoxepines
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  • The synthesis of 2-substituted-4-benzoxepinesand 2,5-disubstituted-4-benzoxepines from aryl iodides andbromoenoates is described. This methodology is based on apalladium-catalyzed aromatic substitution followed by anintramolecular Heck sequence. Under the reaction conditions(Pd(OAc)2 (10 mol %), tri-2-furylphosphine (20 mol %),norbornene (2 equiv), Cs2CO3 (2 equiv), CH3CN, 85 °C),moderate to excellent yields of benzoxepines bearing numerous substituents (Me, F, Cl, etc.) are obtained.
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