Transferring Substituents from Alkynes to Furans and Pyrroles through Heteronorbornadienes as Intermediates: Synthesis of β-Substituted Pyrroles/Furans
作者:Javier García-Domínguez、Marina Carranza、Edijs Jansons、Ana T. Carmona、Inmaculada Robina、Antonio J. Moreno-Vargas
DOI:10.1021/acs.joc.3c01145
日期:2023.9.15
synthetic intermediates for the preparation of 3/4-substituted (β-substituted) furans/pyrroles is presented. The method lies in the inverse electron demand Diels–Alder (iEDDA) cycloaddition between a substituted heteronorbornadiene and an electron-poor tetrazine followed by spontaneous fragmentation of the resulting cycloadduct via two retro-Diels–Alder (rDA) reactions affording a β-substituted furan/pyrrole
介绍了 7-氧杂/氮杂降冰片二烯作为合成中间体用于制备 3/4-取代(β-取代)呋喃/吡咯的用途。该方法在于取代的异降冰片二烯和缺电子四嗪之间的逆电子需求狄尔斯-阿尔德(iEDDA)环加成,然后通过两个逆狄尔斯-阿尔德(rDA)反应将所得环加合物自发裂解,得到β-取代的呋喃/吡咯。在 29 种杂环的制备中探索了这种串联 iEDDA/rDA/rDA 反应的范围。还描述了直接从异降冰片二烯中间体的炔前体开始的一锅法。