Stereoselective Synthesis of Complex Polyenes through Sequential α‐/β‐C−H Functionalization of <i>trans</i>‐Styrenes
作者:Yuhang Zhu、Yini Wang、Wenzhou Shen、Xiaoyu Chen、Qiuhua Liu、Limin Yang、Guofu Zhong、Jian Zhang
DOI:10.1002/anie.202315273
日期:2024.3.18
The α-/β-C−H functionalization of E styrenes with simple alkenes and alkynes is presented. The process involves α C−H functionalization via a six-membered exo-palladacycle to afford tri- and tetrasubstituted 1,3-dienes and β C−H functionalization via a seven-membered endo-palladacycle to produce tetra- and pentasubstituted 1,3,5-trienes, both enabled by the chelation assistance of pyrazinamide.
介绍了 E 苯乙烯与简单烯烃和炔烃的 α-/β-C−H 官能化。该过程涉及通过六元外环钯环进行 α CH 官能化,以提供三取代和四取代的 1,3-二烯,并通过七元内环环进行 β CH 官能化,以产生四取代和五取代的 1,3 ,5-三烯,两者都是通过吡嗪酰胺的螯合辅助实现的。