Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 11, Issue 24, Pages 4068-4076Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ob40667a
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Funding
- NIGMS [GM077170, GM090254]
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R15GM077170, R01GM090254] Funding Source: NIH RePORTER
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Herein, we report a new class of glycosyl donors, benzoxazolyl imidates, for chemical glycosylation. The O-benzoxazolyl (OBox) leaving group was designed with an aim to compare the relative reactivity and stability of similarly structured S-benzoxazolyl (SBox) glycosides (thioimidates) developed in our lab and glycosyl trichloroacetimidates (TCAI, O-imidates) developed by Schmidt. Novel OBox donors can be activated under catalytic conditions and provided excellent yields in glycosylation. The OBox imidates were found to be more reactive than either SBox or TCAI donors. The high reactivity profile was confirmed in direct competitive experiments and was found beneficial for HPLC-assisted solid-phase synthesis.
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