2-amino-7-β-d-arabinofuranosyl-4-methoxy-7H-pyrrolo[2,3-d]pyrimidine: A facile preparation and anomerisation of a 7-deazapurine nucleoside
作者:Frank Seela、Heinz-Dieter Winkeler
DOI:10.1016/0008-6215(83)88032-x
日期:1983.7
-pyrrolo[2,3- d ]pyrimidine with 2,3,5-tri- O -benzyl- d -arabinofuranosyl bromide in benzene—50% aqueous sodium hydroxide—tetrabutylammonium hydrogensulfate gave two anomeric glycosylation products ( 1 and 3 ). Removal of the benzyl groups from 1 and 3 , respectively, with boron trichloride yielded 2-amino-7-(α- and β- d -arabinofuranosyl)-4-methoxy-7 H -pyrrolo[2,3- d ]pyrimidine ( 4 and 2 ). Treatment
摘要2-氨基-4-甲氧基-7 H-吡咯并[2,3-d]嘧啶与2,3,5-三-O-苄基-d-阿拉伯呋喃糖基溴的相转移糖基化在苯50%钠水溶液中氢氧化物-硫酸四丁铵铵得到两个异头糖基化产物(1和3)。用三氯化硼从1和3分别除去苄基,得到2-氨基-7-(α-和β-d-阿拉伯呋喃糖基)-4-甲氧基-7 H-吡咯并[2,3-d]嘧啶( 4和2)。在氮气下用2 m盐酸处理2和4导致不发生糖基裂解的异构化和去甲基化反应,并反映了吡咯并[2,3-d]嘧啶核苷对水解的非凡稳定性。用无水酸将2和4转化为ara -7-脱氮鸟苷或其α端基异构体。