The Ni-catalyzed [8 + 3]-cycloaddition of tropone with 2-aryl- N-tosylaziridines proceeded smoothly under mild reaction conditions, affording various 4-tosyl-2,3,4,4a-tetrahydrocyclohepta[ b][1,4]oxazine derivatives in moderate to excellent yields.
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Liu et al. (2018) studied this question.
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