Studies on the Glycosylation of Pyrrolo[2,3-<i>d</i>] Pyrimidines with 1-<i>O</i>-Acetyl-2,3,5-Tri-<i>O</i>-Benzoyl-β-D-Ribofuranose: The Formation of Regioisomers During Toyocamycin and 7-Deazainosine Syntheses
作者:Peter Leonard、Sachin A. Ingale、Ping Ding、Xin Ming、Frank Seela
DOI:10.1080/15257770903091953
日期:2009.8.11
Glycosylation of silylated 4-amino-6-bromo-5-cyano-7H-pyrrolo[2,3-d]pyrimidine (9) with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-d-ribofuranose (10) under “one-pot” glycosylation conditions (MeCN, TMSOTf) yielded the N-7 isomer 11 together with the N-1 compound 13 (ratio = 2:1). When the same conditions were applied to 4-hydroxy-7H-pyrrolo[2,3-d]pyrimidine (21) the N-3 isomer 22 was the only glycosylation product
甲硅烷基化 4-amino-6-bromo-5-cyano-7H-pyrrolo[2,3-d]pyrimidine (9) 与 1-O-acetyl-2,3,5-tri-O-benzoyl-β- 的糖基化d-呋喃核糖 (10) 在“一锅”糖基化条件(MeCN,TMSOTf)下产生 N-7 异构体 11 和 N-1 化合物 13(比例 = 2:1)。当将相同条件应用于 4-羟基-7H-吡咯并[2,3-d]嘧啶 (21) 时,N-3 异构体 22 是唯一以几乎定量产率形成的糖基化产物。