present invention relates to novel crystalline alkali metal and alkaline earth metal salts of 2′,3′-dideoxy-2′,3′-didehydroinosine. The present invention also provides a novel process for preparation of didanosine in high yield and purity using novel intermediates. Thus, for example, 5′-O-acetyl-2′,3′-dideoxy-2′,3′-didehydroinosine is reacted with monomethyl amine to give 2′,3′-dideoxy-2′,3′-didehydro inosine, which is then reacted with sodium hydroxide and crystallized to give crystalline 2′,3′-dideoxy-2′,3′-didehydroinosine sodium salt. 2′,3′-Dideoxy-2′,3′-didehydroinosine sodium salt is hydrogenated using raney nickel catalyst in aqueous medium and then neutralized with hydrochloric acid to yield didanosine.
本发明涉及2′,3′-二去氧-2′,3′-二脱氢
肌苷的新型晶体碱
金属和碱土
金属盐。本发明还提供了一种使用新型中间体制备高产率和高纯度的
地达诺辛的新工艺。例如,5′-O-乙酰基-2′,3′-二去氧-2′,3′-二脱氢
肌苷与单甲基胺反应,得到2′,3′-二去氧-2′,3′-二脱氢
肌苷,然后与
氢氧化钠反应结晶,得到晶体2′,3′-二去氧-2′,3′-二脱氢
肌苷钠盐。2′,3′-二去氧-2′,3′-二脱氢
肌苷钠盐在
水相中使用Raney
镍催化剂进行氢化,然后用
盐酸中和得到
地达诺辛。