Intramolecular Metal-free C(sp3)-H Activation Enables a Selective Mono O-Debenzylation of Fully Protected Aminosugars
Carbamate-bearing benzylated aminosugars undergo an I2/I(III)-promoted intramolecular hydrogen atom transfer (IHAT) followed by a nucleophilic attack to provide polycyclic structures. Thus, suitably positioned benzyl ethers are surgically oxidized into the corresponding mixed N/O-benzylidene acetals, which can be conveniently deprotected under mild acidic conditions to grant access to selectively O-deprotected aminosugars amenable for further derivatization. The scope of this strategy has been proven with a battery of furanosic and pyranosic scaffolds. Preliminary mechanistic studies, including Hammett LFER and KIE analyses, support a reaction pathway with the nucleophilic cyclization as the rate-determining step.
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Main Authors: | Santana, Andrés G., Herrera, Antonio J., González Martín, Concepción C. |
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Other Authors: | Ministerio de Asuntos Económicos y Transformación Digital (España) |
Format: | artículo biblioteca |
Language: | English |
Published: |
American Chemical Society
2021-12-03
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Subjects: | O-Debenzylation, Intramolecular, Metal-free C(sp3)-H, Aminosugars, |
Online Access: | http://hdl.handle.net/10261/254503 |
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