9-Deazapurine nucleosides. The synthesis of certain<i>N</i>-5-β-d-ribofuranosylpyrrolo[3,2-<i>d</i>]pyrimidines
作者:Nabih S. Girgis、Roland K. Robins、Howard B. Cottam
DOI:10.1002/jhet.5570270211
日期:1990.2
4-dichloro-5-[2,3-O-isopropylidene-5-O-(t-butyl)dimethylsilyl-β-D-ribofuranosyl]-5H-pyrrolo[3,2-d]pyrimidine (4), along with a small amount of the corresponding α anomer, 5. Compound 4 served as the versatile intermediate from which the N-7 ribofuranosyl analogs of the naturally-occurring purine nucleosides adenosine, inosine and guanosine were synthesized. Thus, controlled amination of 4 followed by sugar deprotection
通过2,4-二氯-5 H-吡咯并[3,2 ]的单相钠盐糖基化反应制备了几个N -5呋喃呋喃糖基-2,4-二取代的吡咯并[3,2- d ]嘧啶(9-脱氮嘌呤)核苷。- d ]嘧啶(3使用1-氯-2,3-)ö异亚丙基-5- ö - (吨丁基)dirnethylsilyl-α-d呋喃核糖(2)。使用2进行糖基化避免了“原酰胺”产物1的形成,并提供了出色的β核苷2,4,2-二氯-5- [2,3 - O-异亚丙基-5- O-(t-丁基)二甲基甲硅烷基-β-D-呋喃呋喃糖基] -5 H-吡咯并[3,2- d ]嘧啶(4),以及少量相应的α异构体5。化合物4用作通用中间体,从该中间体可以合成天然存在的嘌呤核苷腺苷,肌苷和鸟苷的N -7核呋喃糖基类似物。因此,控制氨基化4,然后进行糖脱保护和脱卤,得到作为盐酸盐的腺苷类似物4-氨基-5-β-D-呋喃呋喃糖基-5 H-吡咯并[3,2- d ]嘧啶(8)。碱水