Ye W, Stevens CM, Wen P, Simmons CJ, Tang W. Mild Cu(OTf)
2-Mediated C-Glycosylation with Chelation-Assisted Picolinate as a Leaving Group.
J Org Chem 2020;
85:16218-16225. [PMID:
32691596 PMCID:
PMC8138965 DOI:
10.1021/acs.joc.0c01041]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
C-Glycosylation reactions of glycosyl picolinates with allyltrimethylsilane or silyl enol ethers were developed. Picolinate as a chelation-assisted leaving group could be activated by Cu(OTf)2 and avoided the use of harsh Lewis acids. The glycosylations were operated under mild neutral conditions and gave the corresponding C-glycosides in up to 95% yield with moderate to excellent stereoselectivities.
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