Ben Othman R, Fer MJ, Le Corre L, Calvet-Vitale S, Gravier-Pelletier C. Effect of uridine protecting groups on the diastereoselectivity of uridine-derived aldehyde 5'-alkynylation.
Beilstein J Org Chem 2017;
13:1533-1541. [PMID:
28845198 PMCID:
PMC5550804 DOI:
10.3762/bjoc.13.153]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 07/20/2017] [Indexed: 12/17/2022] Open
Abstract
The 5'-alkynylation of uridine-derived aldehydes is described. The addition of alkynyl Grignard reagents on the carbonyl group is significantly influenced by the 2',3'-di-O-protecting groups (R1): O-alkyl groups led to modest diastereoselectivities (65:35) in favor of the 5'R-isomer, whereas O-silyl groups promoted higher diastereoselectivities (up to 99:1) in favor of the 5'S-isomer. A study related to this protecting group effect on the diastereoselectivity is reported.
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