FACILE FLUORINATION OF DEOXY-4'-THIOPYRIMIDINE NUCLEOSIDES WITH DOWN HYDROXYL-GROUPS - RETENTION OF CONFIGURATION AFTER FLUORIDE OPENING OFTHE QUATERNIZED N-3-MEM ANHYDRONUCLEOSIDES
Ls. Jeong et al., FACILE FLUORINATION OF DEOXY-4'-THIOPYRIMIDINE NUCLEOSIDES WITH DOWN HYDROXYL-GROUPS - RETENTION OF CONFIGURATION AFTER FLUORIDE OPENING OFTHE QUATERNIZED N-3-MEM ANHYDRONUCLEOSIDES, Tetrahedron letters, 35(41), 1994, pp. 7573-7576
Attempted fluorination of ro-pentofuranosyl)-3-(2-methoxyethoxymethyl)
uracil (12) and -erythro-pentofuranosyl)-3-(2-methoxyethoxymethyl) ura
cil (14) with diethylaminosulfur trifluoride (DAST) produced very reac
tive N-3-MEM-O-2,2- and N-3-MEM-O-2,3-anhydronucleoside intermediates
(16) that reacted with KF to give the desired fluorinated nucleosides
with retention of configuration.