Reactions of Some 2,3-Anhydro Pyrimidine Nucleosides with Dilithium Tetrahalocuprates
摘要:
The reaction of 1-(2,3-anhydro-5-O-trityl-beta-D-lyxofuranosyl)-2-O-methyluracil (2a) and its thymine analogue (2b) with dilithium tetrahalocuprates (Li(2)CuX(4)) revealed an excellent to perfect regioselectivity, yielding 2,2'-anhydro-3'-halonucleosides (3a-d), while the same reactions with 2,3-anhdro uracil and thymine nucleosides (5a,b) gave arabinosyl (6a-d) and xylosyl halohydrins (7a-d) with respective product ratios of 7:3 to 8:2 which were estimated after mesylation to 8a-d and 9a-d.
Reactions of Some 2,3-Anhydro Pyrimidine Nucleosides with Dilithium Tetrahalocuprates
摘要:
The reaction of 1-(2,3-anhydro-5-O-trityl-beta-D-lyxofuranosyl)-2-O-methyluracil (2a) and its thymine analogue (2b) with dilithium tetrahalocuprates (Li(2)CuX(4)) revealed an excellent to perfect regioselectivity, yielding 2,2'-anhydro-3'-halonucleosides (3a-d), while the same reactions with 2,3-anhdro uracil and thymine nucleosides (5a,b) gave arabinosyl (6a-d) and xylosyl halohydrins (7a-d) with respective product ratios of 7:3 to 8:2 which were estimated after mesylation to 8a-d and 9a-d.