Stereoselective Synthesis of Indazole 2?-Deoxy-?-D-ribonucleosides: Glycosylation of the Nucleobase Anion
作者:Frank Seela、Werner Bourgeois
DOI:10.1002/hlca.19910740209
日期:1991.3.13
b. Compound 1, related to 2′-deoxyadenosine (3), and its regioisomer 2 were obtained from 8b and 9b, respectively, by catalytic hydrogenation. The anomeric configuration as well as the position of glycosylation were determined by 1D NOE-difference spectroscopy. The first protonation site of 1 and 2 was found to be the NH2 group. The N-glycosylic bond of 1H-indazole N1-(2′-deoxyribofuranosides) is more
描述了衍生自4a,b的吲唑基阴离子与2-脱氧-3,5-双-O-(4-甲基苯甲酰基)-α-D-赤-戊呋喃糖酰氯(5)的糖基化。该反应是立体选择性-独家β-d端基异构体的形成-但区域异构Ñ 1 -和ñ 2 - (2'-脱氧β-d-ribofuranosides)(即图6A和7A,RESP,和。图6b和图7b,RESP。 )的数量大致相等。将它们去保护,得到8a,b和9a,b。化合物通过催化氢化,分别从8b和9b获得与2'-脱氧腺苷(3)有关的图1及其区域异构体2。异头物构型以及糖基化的位置通过一维NOE差光谱法确定。发现1和2的第一个质子化位点是NH 2基团。1 H-吲唑N 1-(2'-脱氧核糖呋喃糖苷)的N-糖基键比母体嘌呤核苷的N-糖基键更稳定。化合物1不是腺苷脱氨酶的底物。