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An unprecedented direct reductive amination of electron-deficient amines such as Cbz-, Boc-, EtOCO-, Fmoc-, Bz-, ArSO(2)-, Ar(2)PO-, etc. protected amines with aldehydes is achieved using the Re(2)O(7) catalyst and silanes as the hydride source. Excellent regioselective mono-alkylation and chemoselective reductive-amination were observed.
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Das et al. (2012) studied this question.
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