Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 86, Issue 7, Pages 5336-5344Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.0c02813
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Funding
- Academia Sinica [MOST 108-3114-Y-001002, AS-SUMMIT-109]
- Ministry of Science and Technology [MOST 108-2113-M-001-019-, MOST 109-2113M-001-005-]
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This method allows for selective acetylation of the non-anomeric hydroxyl groups of sugars, while leaving the anomeric hydroxyl group unaffected. The intact anomeric O-TMS group can be functionalized to produce important sugar precursors, simplifying the synthesis process.
Selective modification of the hydroxyl groups of sugars has been a long-standing challenge due to their proximate relative reactivity. Herein, we report a TMSOTf-catalyzed selective acetylation of the non-anomeric hydroxyl groups of several per-O-TMS-protected sugar substrates while leaving their anomeric group unaffected. In addition to standing versatile by itself, the anomeric O-TMS group left intact can be functionalized to afford key sugar precursors such as imidate donors, which could otherwise be synthesized via a stepwise anomeric deprotection-functionalization procedure.
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