8-Azaguanine 2?,3?-Dideoxyribonucleosides: Glycosylation of the 5-amino-7-methoxy-3H-1,2,3-triazolo[4,5-d]pyrimidinyl anion with 2,3-dideoxy-D-glycero-pentofuranosyl chloride
作者:Frank Seela、Karin Mersmann
DOI:10.1002/hlca.19930760603
日期:1993.9.22
N7-, N8-, and N9-(β-D-2′,3′-dideoxyribonucleosides) (1, 2, and 3, respectively) and of the diamino derivative 13 is described. The anion of 5-amino-7-methoxy-3H-1,2,3-triazolo[4,5-d]pyrimidine (5) was glycosylated with 5-O-[(tert-butyl)dimethylsilyl]-2,3-dideoxy-D-glycero-pentofuranosyl chloride (6; anomeric mixture), yielding the regioisomeric 2′,3′-dideoxyribofuranosides as anomeric mixtures 7a/10a
区域异构体8-氮杂鸟嘌呤N 7-,N 8-和N 9-(β-D-2',3'-二脱氧核糖核苷)(分别为1、2和3)和二氨基衍生物13的合成为描述。将5-氨基-7-甲氧基-3 H -1,2,3-三唑并[4,5- d ]嘧啶(5)的阴离子用5- O -[(叔丁基)二甲基甲硅烷基] -2进行糖基化, 3-二脱氧-D-甘油-呋喃呋喃糖酰氯(6 ;端基异构体混合物),产生区域异构体2',3'-二脱氧核糖呋喃糖苷为端基异构体混合物7a / 10a,8a / 11a和9a / 12a。它们在THF中被Bu 4 NF甲硅烷基化,得到5-氨基-7-甲氧基-核苷7b-12b。用NaOH水溶液处理得到8-氮杂鸟嘌呤的β-D-2',3'-二脱氧核苷1-3和它们的α-D-端基异构体14-16。7b与NH 3 / MeOH的反应产生二氨基化合物13。8-氮杂-2',3'-二脱氧鸟苷(1)的N-糖基键比2',3'-二脱氧鸟