Abstract
Abstract The reaction of 1-(2,3-anhydro-5-0-trityl-β-D-lyxofuranosyl)-2-0-methyluracil (2a) and its thymine analogue (2b) with dilithium tetrahalocuprates (Li2CuX4) 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.
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