The synthesis and properties of 7-deazapurine β-L-nucleosides are described. The stereoselective glycosylation of the anions of 2-amino-6-chloro-7-deazapurines 9a, 9b or 6-chloro-7-deazapurines 13a, 13d with 3,5-di-O-(4-methylbenzoyl)-2-deoxy-α-L-erythro-pentofuranosyl chloride (8) furnished the β-L-2'-deoxyribonucleosides 1-4. The synthesis of β-L-ribonucleosides 5-7 used the Silyl-Hilbert-Johnson reaction (TMSOTf/BSA/MeCN) performed under Vorbrüggen conditions for the glycosylation of 7-halogenated 6-chloro-2-pivalamido-7-deazapurines 17b-17d with 1-O-acetyl-2,3,5-tri-O-benzoyl-L-ribofuranose (16). Single-crystal X-ray analyses were performed and CD spectra were measured to assign the configuration. The antiviral activity against selected DNA and RNA viruses is reported.
描述了7-去
氮嘌呤β-L-核苷的合成和性质。以2-
氨基-6-
氯-7-去
氮嘌呤的阴离子
9a、
9b或6-
氯-7-去
氮嘌呤的阴离子
13a、
13d在3,5-二-
O-(对
甲基苯甲酰)-2-
脱氧-α-L-
erythro-戊呋糖
氯化物(
8)的条件下进行立体选择性糖基化,得到了β-
L-2'-
脱氧核苷
1-
4。β-
L-核糖核苷
5-
7的合成使用了Silyl-Hilbert-Johnson反应(
TMSOTf/
BSA/MeCN),在Vorbrüggen条件下进行了对7-卤代的6-
氯-2-哌瓦
酰胺基-7-去
氮嘌呤17b-
17d与1-
O-
乙酰基-2,3,5-三-
O-
苯甲酰-
L-核糖呋糖(
16)的糖基化。进行了单晶X射线分析并测量了CD光谱以确定构型。报道了对选定DNA和RNA病毒的抗病毒活性。