Novel base-promoted addition-elimination reaction of electron-deficient benzylidene derivatives with N-phenyl-1,2,4-triazole-3,5-dione (PTAD)
Abstract
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.