Dearomative 1,3-dipolar cycloadditions of 1-Boc-pyrroles with generated silver α-bromo alkylidenenitronates delivered a series of 3,6-dihydro-4-Boc-pyrrolo[2,3-]isoxazole-2-oxides (17-91% yields) under very mild conditions. -Deoxygenation of the cycloaddition product gave a dihydro-pyrrolo[2,3-]isoxazole, elaborations of which produced various functionalized 2,3-dihydropyrroles and pyrrolidines, showcasing the potential utilities of our new strategy of pyrrole dearomatization.
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