Ls. Jeong et al., UNANTICIPATED RETENTION OF CONFIGURATION IN THE DAST FLUORINATION OF DEOXY-4'-THIOPYRIMIDINE NUCLEOSIDES WITH UP HYDROXYL-GROUPS, Tetrahedron letters, 35(41), 1994, pp. 7569-7572
Fluorination of -3-deoxy-4-thio-beta-D-threo-pentofuranosyl)uracil (17
) and -2-deoxy-4-thio-beta-D-threo-pentofuranosyl)uracil (20) with DAS
T proceeded with exclusive retention of configuration. The structures
of the products were confirmed by X-ray analysis.