| Abstract
| - Inter- and intramolecular hetero-Diels−Alderreactions in a series of functionalized 2(1H)-pyrazinoneswere investigated under controlled microwave irradiation.The cycloaddition reactions were efficiently performed insealed tubes, utilizing either a combination of 1,2-dichloroethane and a thermally stable ionic liquid, or 1,2-dichlorobenzene as reaction medium. In all cases, a significantrate-enhancement using microwave flash heating as compared to thermal heating was observed.
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