2′-O-anhydro(1-β-D-arabinofuranosyl) uracil (3b) is described. The active intermediates, 2′,3′-O-sulfinyl cytidine (2a) and 2′,3′-O-sulfinyl uridine (2b), were prepared from the corresponding nucleosides (1a or 1b) by successive treatment with thionyl chloride in acetonitrile and with water. The 2,2′-O-anhydropyrimidine nucleosides were formed quantitatively by heating the intermediates in an acidic aqueous solution
描述了 2,2'-O-脱
水(1-β-D-阿拉伯
呋喃糖基)
胞嘧啶 (3a) 和 2,2'-O-脱
水(1-β-D-阿拉伯
呋喃糖基)尿
嘧啶 (3b) 的合成。活性中间体 2',3'-O-亚磺酰基
胞苷 (2a) 和 2',3'-O-亚磺酰基
尿苷 (2b) 由相应的核苷 (1a 或 1b) 通过在
乙腈和
水。通过在酸性
水溶液或
N,N-二甲基甲酰胺中在
乙酸钠存在下加热中间体,定量形成 2,2'-O-脱
水嘧啶核苷。用碱处理脱
水核苷得到相应的阿拉伯核苷。