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Intramolecular hetero Diels–Alder cycloaddition of alkenyl-tethered 2(1H)-pyrazinones (10). Reagents and conditions: a) 1,2-dichloroethane, [BMIM][PF6]; conventional conditions: 132 °C, 1–2 d, 54%; microwave irradiation: 170 °C (300 W), 10 min, 67–77 %. Box: structure of [BMIM][PF6]. Result: acceleration.
