Efficient Synthesis of Methyl 3,5-Di-<i>O</i>-benzyl-α-<scp>d</scp>-ribofuranoside and Application to the Synthesis of 2‘-<i>C</i>-β-Alkoxymethyluridines
作者:Nan-Sheng Li、Jun Lu、Joseph A. Piccirilli
DOI:10.1021/ol071075b
日期:2007.8.1
Methyl 3,5-di-O-arylmethyl-alpha-D-ribofuranosides have been used extensively as synthons to construct 2'-C-branched ribonucleosides. Herein, we describe efficient access to methyl 3,5-di-O-arylmethyl-alpha-D-ribofuranosides (aryl: 2-ClC6H4, 3-ClC6H4, 4-ClC6H4, 4-BrC6H4, 2,4-Cl2C6H3, Ph) in 72-82% yields from methyl D-ribofuranoside. We also demonstrate efficient access to the versatile precursor methyl 3,5-di-O-benzyl-alpha-D-ribofuranoside (3f) and the synthesis of 2'-C-beta-methoxymethyl- and 2'-C-beta-ethoxymethyluridine in six steps from 3f with overall yields of 18% and 32%, respectively.