Synthesis of 8-Aza-2?-deoxyadenosine and related 7-Amino-3H-1,2,3-triazolo[4,5-d]pyrimidine 2?-Deoxyribofuranosides: Stereoselective glycosylationvia the nucleobase anion
作者:Zygmunt Kazimierczuk、Uwe Binding、Frank Seela
DOI:10.1002/hlca.19890720715
日期:1989.11.1
The synthesis of 8-aza-2′-deoxyadenosine ( = 7-amino-3H-1,2,3 triazolo[4,5-d]pyrimidine N3-(2′-deoxy-β-D-ribofuranoside); 1) as well as the N2- and N1-(2′-deoxy-β-D-ribofuranosides) 2 and 3 is described. Glycosylation of the anion of 7-amino-3H-1,2,3-triazolo[4,5-d]pyrimidine (6) in DMF yielded three regioisomeric protected 2′-deoxy-β-D-ribofuranosides, i.e. the N3-, N2-, and N4-glycosylated isomers
合成8-氮杂-2'-脱氧腺苷(= 7-氨基-3 H -1,2,3三唑并[4,5- d ]嘧啶N 3-(2'-脱氧-β-D-呋喃呋喃糖苷);描述了1)以及N 2-和N 1-(2'-脱氧-β-D-呋喃核糖苷)2和3。的7-氨基-3阴离子的糖基化ħ -1,2,3-三唑并[4,5- d ]嘧啶(6在DMF中),得到3区域异构保护2'-脱氧β-d-ribofuranosides,即所述Ñ 3-,N 2-和N 4-糖基化异构体7(14%),9(11%)和11(3%),以及几乎等量的α-D-异头物8(13%),10(12%)和12(4%;方案1)。反应变成立体选择性的β-d核苷如果-7-甲氧基- 3的阴离子ħ -1,2,3-三唑并[4,5- d ]嘧啶(13)在MeCN中糖基化:仅Ñ 3 - ,N 2和N 1-(2'-deoxy-β-D-nucleosides)14(29%),15(32%)和16分别形成了(23%)(方案2)。NH