The reaction of electron-deficient benzylidene derivatives with PTAD afforded the double Diels–Alder product and the Diels–Alder ene product; the latter underwent novel base-induced elimination of phenyl urazole via a stable carbanion.
缺电子的苯亚甲基衍
生物与
PTAD 反应生成了双 Diels-Alder 产物和 Diels-Alder ene 产物;后者通过一个稳定的碳阴离子,在新的碱诱导下消除了苯基乌拉唑。