(E)‐2‐bromo‐4‐aryl‐1,3‐pentadiene was developed and resulted in a series of “butterfly‐like” bicyclo[2.2.2]octene derivatives in moderate to good yields without the need for a metal catalyst. The proposed mechanism involves a [1,5]‐sigmatropic hydrogen migration and HBr elimination. Through this decisive [1,5]‐hydrogen shift step, the electronic properties and steric hindrance of the conjugated diene substrate
(E)-2-
溴-4-4-芳基-
1,3-戊二烯的意外的双重Diels-Alder(
DDA)反应得到了开发,并导致了一系列“蝴蝶状”双环[2.2.2]
辛烯衍
生物不需要
金属催化剂即可获得中等至良好的收率。拟议的机制涉及[1,5]-σ氢迁移和HBr消除。通过这一决定性的[1,5]-氢转移步骤,共轭二烯底物的电子性质和位阻完全改变,并且该潜在二烯合成子的
DDA反应得以成功实现。