Furo[3,4-<i>b</i>]benzodioxin Cycloadditions - A One-Pot Synthesis of Functionalized Bis-Adducts
作者:Consol Bozzo、Núria Mur、Pere Constans、Maria Dolors Pujol
DOI:10.1002/ejoc.200800967
日期:2009.5
Furo[3,4-b]benzodioxin 1 was found to undergo a doubleDiels–Alder reaction with several dienophiles. The diene reacts directly with the suitable dienophile to give the mono-adduct intermediate that unexpectedly leads to a second cycloaddition at the internal, electron-rich, oxabicyclic C4a–C10a double bond. The resulting bis-adducts were formed under relatively mild conditions with dienophiles ranging
Furo[3,4-b]benzodioxin 1 被发现与几个亲二烯体发生双重Diels-Alder 反应。二烯直接与合适的亲二烯体反应,生成单加合物中间体,出人意料地导致内部富电子氧双环 C4a-C10a 双键发生第二次环加成。所得双加合物是在相对温和的条件下形成的,亲二烯体的范围从马来酸酐和乙炔二甲酸二甲酯到反应性极强的芳烃。使用这种两个不间断连续环加成反应的方法,观察到稳定双加合物的有趣形成。在这项工作中首次描述了 1,4-苯并二恶英的亲二烯体行为。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)