We have synthesized 2'-deoxy-2' (S) -methylcytidine (7), a new antileukemic nucleoside. The carbonyl methylation of 2'-ketonucleoside (1) with MeLi, Me3Al and MeMgX was examined. Only in the reaction with MeMgX, did the more hindered β-attack afford the 2'-methyl-t-alcohol (2b). Compound 2b was converted into the methyl oxalate (4), which was subjected to radical deoxygenation to give the 2'-deoxy-2' (S) -methyl derivative (5). The deprotection of 5 followed by substitution with NH3 furnished 7. The structure-activity relationships of 7 and some other 2'-branched-chain sugar cytidines against L1210 cells are also described.
我们合成了 2'-deoxy-2' (S) -methylcytidine (7),这是一种新的抗白血病核苷。我们研究了 2'- 酮核苷 (1) 与 MeLi、Me3Al 和 MeMgX 的羰基甲基化反应。只有在与 MeMgX 的反应中,受阻程度较高的 β 攻击才会产生 2'-甲基-t-醇(2b)。化合物 2b 被转化成
草酸甲酯 (4),再经过自由基脱氧反应,得到 2'-deoxy-2' (S) -methyl 衍
生物 (5)。7 和其他一些 2'- 支链糖
胞苷对 L1210 细胞的结构-活性关系也得到了描述。