在三个反应步骤中,由苄基溴在过量甲醇甲醇存在下,处理由适当的未保护尿苷制备的15 N 4标记的胞苷N 3-氧化物和15 N 4标记的2'-脱氧胞苷N 3-氧化物即使在温和的条件下,其Dimroth重排的顺利发生也导致相应的15 N 3标记的尿苷4- O-苄基肟,它们很容易经历还原性N - O键断裂,得到所需的15 N 3标记的胞嘧啶核苷具有很高的总收率。
A New and Efficient Synthetic Method for <sup>15</sup><i>N</i><sub>3</sub>-Labeled Cytosine Nucleosides: Dimroth Rearrangement of Cytidine <i>N</i><sub>3</sub>-Oxides
作者:Magoichi Sako、Hiroyoshi Kawada
DOI:10.1021/jo0486241
日期:2004.11.1
N3-oxide, prepared from the appropriate unprotected uridines in three reaction steps, with benzyl bromide in the presence of excess lithium methoxide allowed the smooth occurrence of their Dimrothrearrangement even under mild conditions leading to the corresponding 15N3-labeled uridine 4-O-benzyloximes which can easily undergo the reductive N−O bond cleavage to give the desirable 15N3-labeled cytosine
在三个反应步骤中,由苄基溴在过量甲醇甲醇存在下,处理由适当的未保护尿苷制备的15 N 4标记的胞苷N 3-氧化物和15 N 4标记的2'-脱氧胞苷N 3-氧化物即使在温和的条件下,其Dimroth重排的顺利发生也导致相应的15 N 3标记的尿苷4- O-苄基肟,它们很容易经历还原性N - O键断裂,得到所需的15 N 3标记的胞嘧啶核苷具有很高的总收率。