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Background: The behavior of N-tosylnitroindoles acting as electrophilic dienophiles in polar Diels-Alder reactions joint to different dienes was analyzed. Reactions were developed under microwave irradiation using toluene or protic ionic liquids as solvents under solvent-free conditions. Good yields in short reaction times were observed. Solvent-free conditions and protic ionic liquids as solvents offered similar results. However, solvent-free conditions favor environmental sustainability. The processes between N-substituted nitroindoles and isoprene were selected for a theoretical study.
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Mancini et al. (2017) studied this question.
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