Pan M, Shen Y, Li Y, Shen C, Li W. B
2(OH)
4-Mediated Reductive Ring-Opening of
N-Tosyl Aziridines by Nitroarenes: A Green and Regioselective Access to Vicinal Diamines.
J Org Chem 2024;
89:8656-8667. [PMID:
38831644 DOI:
10.1021/acs.joc.4c00591]
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Abstract
The nucleophilic ring-opening of aziridine derivatives provides an important synthetic tool for the preparation of various β-functionalized amines. Amines as nucleophiles are employed to prepare synthetically useful 1,2-diamines in the presence of various catalysts or activators. Herein, the B2(OH)4-mediated reductive ring-opening transformation of N-tosyl aziridines by nitroarenes was developed. This aqueous protocol employed nitroarenes as cheap and readily available amino sources and proceeds under external catalyst-free conditions. Control experiments and DFT calculations pointed to the in situ reduction of nitroarenes to aryl amines via N-aryl boramidic acid (E) and an SN1-type ring-opening of N-tosylaziridines by the resultant aryl amines with high regioselectivity.
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