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Several mono- and disubstituted 5,6-dihydro-4H-pyrrolo[1,2-c] [1,2,3]triazoles have been prepared via intramolecular 1,3-dipolar cycloadditions of azides with alkynes. These triazoles are analogues of the antitumor dehydropyrrolizidine alkaloids.
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Pearson et al. (1990) studied this question.
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