作者:Philip Garner、Ji Uk Yoo、Ramakanth Sarabu
DOI:10.1016/s0040-4020(01)80438-5
日期:1992.1
The stereo- and regiocontrolled synthesis of pyranosyl 2-aminopurine nucleosides is described. Coupling of bissilylated N2-acetyl-2-aminopurine with peracetylated glucopyranosides (SnCl4, (CH2Cl)2-MeCN, reflux) afforded good yields of the corresponding N9-β-2-aminopurine nucleosides. Glycosylation of N2-acetyl-2-amino-6-chloropurine could be made to produce either N9-nucleosides (TMSOTf, (CH2Cl)2,
描述了吡喃糖基2-氨基嘌呤核苷的立体和区域控制合成。双甲硅烷基化的N 2-乙酰基-2-氨基嘌呤与过乙酰化的吡喃葡萄糖苷(SnCl 4,(CH 2 Cl)2 -MeCN,回流)的偶联提供了相应的N 9 - β -2-氨基嘌呤核苷的良好产率。N 2-乙酰基-2-氨基-6-氯嘌呤的糖基化可以产生N 9-核苷(TMSOTf,(CH 2 Cl)2,回流)或N 7-核苷(SnCl 4 / MeCN,室温) )选择性。纳氏硫糖苷程序(NIS + TfOH,(CH 2Cl)2,在室温下)产生具有任一碱基的N 9-核苷。通过氢解(H 2,Pd / C)将2-氨基-6-氯嘌呤衍生物转化为它们相应的2-氨基嘌呤核苷。还介绍了用于建立碱基区域化学和异头立体化学的便捷NOESY方案。