Syntheses of Acyclo‐<i>C</i>‐nucleoside Analogs from 2,3:4,5‐Di‐<i>O</i>‐isopropylidene‐<scp>D</scp>‐xylose
作者:Iran Otero、Karen Methling、Holger Feist、Manfred Michalik、José Quincoces、Helmut Reinke、Klaus Peseke
DOI:10.1080/07328300500388693
日期:2005.11.1
Treatment of 1,2-dideoxy-4,5:6,7-di- O -isopropylidene-D- xylo -hept-1-yn-3-uloses 4a,b with hydrazine hydrate and amidines yielded the 3-(1,2:3,4-di- O -isopropylidene-D- xylo -1,2,3,4-tetrahydroxy-butyl)-5-phenyl-1 H (2 H )-pyrazole 5 and the substituted 4-(1,2:3,4-di- O -isopropylidene-D- xylo -1,2,3,4-tetrahydroxy-butyl)pyrimidines 7a-f, respectively. Reaction of 4a,b with 2-amino-benzimidazol afforded the 2-(1,2:3,4-di- O -isopropylidene-D- xylo -1,2,3,4-tetrahydroxy-butyl)benzo[4,5]imidazo[1,2- a ]pyrimidines 9a,b. Compound 4a and 5-amino-pyrazole-4-carbonic acid derivatives yielded the 5-(1,2:3,4-di- O -isopropylidene-D- xylo -1,2,3,4-tetrahydroxy-butyl)pyrazolo[1,5- a ]pyrimidines 11a-d. Deprotection of pyrazole 5, pyrimidine 7a, and pyrazolo[1,5- a ]pyrimidine 11b yielded the acyclo- C -nucleosides 6, 8, and 12, respectively.