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- W4387003003 abstract "Starting from a commercially available thioether, we report a nine-step synthesis of a 4'-thiouridine phosphoramidite building-block. We install the uracil nucleobase using Pummerer-type glycosylation of a sulfoxide intermediate followed by a series of protecting group manipulations to deliver the desired phosphite. Notably, we introduce a 3',5'-O-di-tert-butylsilylene protecting group within a 4'-thiosugar framework, harnessing this to ensure regiospecific installation of the 2'-O-silyl protecting group. We envisage this methodology will be generally applicable to other 4'-thionucleosides and duly support the exploration of their inclusion within related nucleic acid syntheses. © 2023 The Authors. Current Protocols published by Wiley Periodicals LLC. Basic Protocol 1: (2R,3S,4R)-2,3-O-Isopopropylidene-5-O-tert-butyldiphenylsilyl-1-(4-sulfinyl)cyclopentane: Sulfoxidation Basic Protocol 2: 2',3'-O-Isopropylidene-5'-O-tert-butyldiphenylsilyl-4'-thiouridine: Pummerer glycosylation Basic Protocol 3: 4'-Thiouridine: Deprotection Basic Protocol 4: 2'-O-tert-Butyldimethylsilyl-3',5'-di-tert-butylsiloxy-4'-thiouridine: 2',3',5'-O-silylation Basic Protocol 5: 2'-O-tert-Butyldimethylsilyl-4'-thiouridine: Selective 3'-5'-desilylation Basic Protocol 6: 2'-O-tert-Butyldimethylsilyl-5'-O-dimethoxytrityl-4'-thiouridine: 5'-O-dimethoxytritylation Basic Protocol 7: 2'-O-tert-butyldimethylsilyl-3'-O-[(2-cyanoethoxy)(N,N-diisopropylamino)phosphino]-5'-O-dimethoxytrityl-4'-thiouridine: 3'-O-phosphitylation." @default.
- W4387003003 created "2023-09-26" @default.
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- W4387003003 date "2023-09-01" @default.
- W4387003003 modified "2023-09-27" @default.
- W4387003003 title "Preparation of a 4′‐Thiouridine Building‐Block for Solid‐Phase Oligonucleotide Synthesis" @default.
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- W4387003003 doi "https://doi.org/10.1002/cpz1.878" @default.
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