The Stereochemical Outcome of the DAST Fluorination of 4′-Thiopyrimidine Nucleosides with “Up” Hydroxyl Groups is Controlled by the Oxidation State of the Sulfur Atom
Unanticipated retention of configuration in the DAST fluorination of deoxy-4′-thiopyrimidine nucleosides with “up” hydroxyl groups
摘要:
Fluorination of 1-(5-O-trityl-3-deoxy-4-thio-beta-D-threo-pentofuranosyl)uracil (17) and 1-(5-O-trityl-2-deoxy-4-thio-beta-D-threo-pentofuranosyl)uracil (20) with DAST proceeded with exclusive retention of configuration. The structures of the products were confirmed by X-ray analysis.