Intramolecular cyclisation of ω-azidoalkyl boronic esters occurs in the presence of boron trichloride and leads, after hydrolysis, to the corresponding pyrrolidines or piperidines.
J. M. Jego, B. Carboni, M. Vaultier and R. Carrié, J. Chem. Soc., Chem. Commun., 1989, 142 DOI: 10.1039/C39890000142
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