Method for the preparation of 2-halo-2'-deoxyadenosine compounds for 2'-deoxyguanosine
申请人:Robins J. Morris
公开号:US20070032645A1
公开(公告)日:2007-02-08
The present invention is a method for preparing 2-halo-6-aminopurines, and more specifically for preparing the clinical agent cladribine (2-chloro-2′-deoxyadenosine, CldAdo, 4), a drug of choice against hairy-cell leukemia and other neoplasms, from 2-amino-6-oxopurines, which are readily obtained from the naturally occurring compound 2′-deoxyguanosine. According to the methods of the present invention, the 6-oxo group of a protected 2′-deoxyguanosine (1) is converted to a 6-(substituted oxy) leaving group, or alternatively to a 6-chloro leaving group, the 2-amino group is replaced with a 2-chloro group, the 6-(substituted oxy) leaving group, or alternatively the 6-chloro leaving group, is replaced with a 6-amino group or, alternatively, a 2,6-dichloro substituted compound is selectively replaced with a 6-amino group, and the protecting groups are removed.
本发明涉及一种制备2-卤代-6-氨基嘌呤的方法,更具体地说,是从2-氨基-6-氧代嘌呤制备临床药物克拉德霉素(2-氯-2'-脱氧腺苷,CldAdo,4),这是一种用于治疗毛细胞白血病和其他肿瘤的首选药物。2-氨基-6-氧代嘌呤是从天然存在的2'-脱氧鸟苷中容易得到的。根据本发明的方法,保护的2'-脱氧鸟苷(1)的6-氧代基被转化为6-(取代氧)离去基,或者替代为6-氯离去基,2-氨基被替换为2-氯基,6-(取代氧)离去基或者6-氯离去基被替换为6-氨基或者2,6-二氯取代化合物被选择性地替换为6-氨基,并去除保护基。