Synthesis of Substituted 1‐<i>\C\</i>‐Phenyl‐<scp>D</scp>‐Tetritols and 1‐<i>C</i>‐(1<i>H</i>‐Pyrazol‐4‐yl)‐<scp>D</scp>‐tetritols by Ring Transformation of 2‐Formylglycals
作者:Alina Montero、Manfred Michalik、Holger Feist、Helmut Reinke、Ivo Rudloff、Klaus Peseke
DOI:10.1081/car-200035732
日期:2004.12.27
2-Formylglycals 1a,b reacted with dialkyl 3-oxoglutarates in the presence of base to furnish the 5-[(1R,2R(S),3R)-1,2,4-tris(benzyloxy)-3-hydroxy-butyl]-2-hydroxy-isophthalic acid dialkyl esters 2a-d. Treatment of la,b with hydrazine derivatives afforded the substituted 1,2,4-tri-O-benzyl-1C-(1H-pyrazol-4-yl)-D-tetritols 5a-d. Deprotection of 5a,b was achieved with Pd/H-2 to yield the 1C-(1-methyl-1H-pyrazol-4-yl)-D-tetritols 6a,b.