Synthesis of (1R,2S)- and (1S,2S)-3-(4-carbamoyl-1,2,3-triazol-1-yl)-1,2-dihydroxypropylphosphonates

Good regioselectivity (86:14 and 80:20) was observed in the 1,3-dipolar cycloaddition of methyl propiolate to diastereoisomeric dimethyl (1R,2S)- and (1S,2S)-3-azido-2-benzyloxy-1-hydroxypropylphosphonates. The major 4-Inethoxycarbonyl regioisomers were transformed into O-methyl (1R,2S)- and (1S,2S)-3-(4-carbamoyl-1,2,3-triazol-1-yl)-1,2-dihydroxypropylphosphonic acids, structural analogues of ribavirin. (C) 2004 Elsevier Ltd. All rights reserved.