Regioselective halogenation of some 2,3-anhydro pyrimidine nucleosides with dilithium tetrahalocuprates. |
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| Authors: | K Minamoto K Watanabe K Yanagihara |
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| Institution: | Department of Applied Chemistry, School of Engineering, Nagoya University, Japan. |
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| Abstract: | The reaction of 1-(2,3-anhydro-5-O-trityl-beta-D-lyxofuranosyl)-2-O-methyluracil (1a) and its thymine analogue (1b) with dilithium tetrahalocuprate (Li2CuX4) revealed excellent to perfect regioselectivity, yielding 2,2'-anhydro-3'-halonucleosides (2a-d), while the same reactions with 2,3-anhydro uracil and thymine nucleosides (4a,b) gave arabinosyl (5a-d) and xylosyl halohydrins (6a-d) with the respective product ratio of 7:3 to 8:2. compounds 5 and 6 were isolated as the 2-O-(7) and 3- O-mesyl derivatives (8). |
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