One-Step Halogenation at the 2'-Position of Uridine, and Related Reactions of Cytidine and N<SUP>4</SUP>-Acetylcytidine
作者:RYUJI MARUMOTO、MIKIO HONJO
DOI:10.1248/cpb.22.128
日期:——
The reaction of uridine with acyl bromide in acetonitrile (or ethyl acetate) afforded 3', 5'-di-O-acyl-2'-bromo-2'-deoxyuridine (II, V) in good yield, which was converted to 2'-deoxyuridine by hydrogenation and subsequent deacylation. A silmiar reaction of N4-acetylcytidine with acetyl bromide yielded 1-(2, 5-di-O-acetyl-3-bromo-3-deoxy-β-D-xylofuranosyl)-N4-acetylcytosine (VIII), which was converted to 3'-deoxycytidine (X) by hydrogenation and subsequent deacylation with a concomitant formation of 2', 3'-dideoxycytidine (XII) and to 1-β-D-arabinofuranosyl cytosine (XI) by treatment with potassium hydroxide in ethanol. A similar reaction of cytidine with acyl bromide gave 2, 2'-anhydro-1-(3, 5-di-O-acyl-β-D-arabinofuranosyl) cytosine hydrobromide (XIV, XVI). These reaction mechanisms were also presented.
尿苷与酰基溴在乙腈(或乙酸乙酯)中反应,可得到 3',5'-二-O-乙酰基-2'-溴-2'-脱氧尿苷(II,V),收率很高。N4-acetylcytidine 与乙酰溴的硅烷化反应生成 1-(2,5-二-O-乙酰基-3-溴-3-脱氧-β-D-呋喃木糖基)-N4-乙酰基胞嘧啶(VIII)、在乙醇中用氢氧化钾处理后,转变为 1-β-D-arabinofuranosyl cytosine (XI)。胞苷与酰基溴发生类似反应,生成 2,2'-脱水-1-(3,5-二-O-酰基-β-D-阿拉伯呋喃糖基)胞嘧啶氢溴酸盐(XIV,XVI)。还介绍了这些反应机理。