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2‘-C-Branched Ribonucleosides. 2. Synthesis of 2‘-C-β-Trifluoromethyl Pyrimidine Ribonucleosides1

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journal contribution
posted on 2001-03-08, 00:00 authored by Nan-Sheng Li, Xiao-Qing Tang, Joseph A. Piccirilli
The first synthesis of 2‘-C-β-trifluoromethyl pyrimidine ribonucleosides is described. 1,2,3,5-Tetra-O-benzoyl-2-C-β-trifluoromethyl-α-d-ribofuranose (3) is prepared from 1,3,5-tri-O-benzoyl-α-d-ribofuranose (1) in three steps and converted to 3,5-di-O-benzoyl-2-C-β-trifluoromethyl-α-d-1-ribofuranosyl bromide (5). The 1-bromo derivative (5) is found to be a powerful reaction intermediate for the synthesis of ribonucleosides. The reaction of silylated pyrimidines with (5) in the presence of HgO/HgBr2 affords exclusively the β-anomers (68). Deprotection of (68) with ammonia in methanol yields the 2‘-C-β-trifluoromethyl nucleosides (911).

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