cs8b02337_si_001.pdf (2.89 MB)
Boron-Catalyzed Site-Selective Reduction of Carbohydrate Derivatives with Catecholborane
journal contribution
posted on 2018-07-24, 00:00 authored by Jared
M. Lowe, Youngran Seo, Michel R. GagnéCatalytic
sp3 C–O bond cleavage using B(C6F5)3/HBcat is reported. This method
is first demonstrated on simple ethers and silyl protected alcohols,
which exhibit reactivity parallel to the known B(C6F5)3/HSiR3 system. In more complex carbohydrate
derivatives, however, unique selectivities that are not possible with
hydrosilane reductants have been achieved, including regioselective
cyclizations. Preliminary computational studies suggest that diboryl
oxonium ions are disfavored and that four-coordinate boronium ions
may contribute to selectivity.
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CatalyticselectivitieHBcatregioselective cyclizationsCatecholboraneBoron-Catalyzed Site-Selective Reductionetherexhibit reactivitycarbohydrate derivativesmethodsilylHSiRPreliminaryCarbohydrate Derivativesselectivityfour-coordinate boronium ionsdiboryl oxonium ionsspcleavagehydrosilane reductantsbond
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