Pd‐Catalyzed Cyclization of Alkynyl Norbornene Derivatives for the Synthesis of Benzofused Heteroarenes
作者:Hayeon Kwak、Eunsu Kang、Jae Yeong Song、Geunhee Kang、Jung Min Joo
DOI:10.1002/adsc.202100763
日期:2021.11.9
Modular approaches, which allow a systematic variation of heteroaromatic cores and substituents, are crucial for the development of heteroaromatic drug candidates and organic functional materials. A new strategy involving the cyclization of heteroarenes tethered with alkynes through a norbornene bridge was developed. The precursors were readily prepared by a three-component coupling process of heteroaryl
模块化方法允许杂芳族核心和取代基的系统变化,对于杂芳族候选药物和有机功能材料的开发至关重要。开发了一种涉及通过降冰片烯桥与炔烃相连的杂芳烃环化的新策略。前体很容易通过杂芳基卤化物、降冰片二烯和末端炔烃的三组分偶联过程制备。源自 Pd(OAc) 2的 Pd 催化体系和 2-(吡唑-1-基)吡啶将各种五元杂芳烃转化为相应的苯并稠合产物,包括(二)苯并噻吩、吲唑、咔唑、吲哚和苯并呋喃,在 C4(C7 ) 位置。在环化过程中,降冰片烯环发生逆狄尔斯-阿尔德反应,作为乙炔合成子。这种方法用于从富电子芳烃合成萘衍生物,证明了其在(杂)芳环成环方面的多功能性。