Njeri DK, Valenzuela EA, Ragains JR. Leveraging Trifluoromethylated Benzyl Groups toward the Highly 1,2-
Cis-Selective Glucosylation of Reactive Alcohols.
Org Lett 2021;
23:8214-8218. [PMID:
34677075 PMCID:
PMC8576833 DOI:
10.1021/acs.orglett.1c02947]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Here, we demonstrate that substitution of the benzyl groups of glucosyl imidate donors with trifluoromethyl results in a substantial increase in 1,2-cis-selectivity when activated with TMS-I in the presence of triphenylphosphine oxide. Stereoselectivity is dependent on the number of trifluoromethyl groups (4-trifluoromethylbenzyl vs 3,5-bis-trifluoromethylbenzyl). Particularly encouraging is that we observe high 1,2-cis-selectivity with reactive alcohol acceptors.
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