申请人:The United States of America as represented by the Department of Health,
公开号:US04210745A1
公开(公告)日:1980-07-01
The present invention is an improved multi-step process for the production of 9-.beta.-D-arabinofuranosyl-2-fluoroadenine (2-F-AraA) and an improvement over the process of Montgomery and Hewson, J. Med. Chem., 12:498 (1969). This compound is an important tool in antitumor therapy and has shown activity against leukemia L1210 and P388 in animals as well as being a potent antiviral agent. Its therapeutic effectiveness occurs because 2-F-AraA is not a substrate for adenosine deaminase which vitiated against the activity of the parent compound 9-.beta.-D-arabinofuranosyladenine (araA) as indicated in experimental animal cancers. An advantage of making 2-F-AraA by the present process is that there is a sharply increased yield based on the chlorosugar up to about 400 percent. In the present improved process the differences lie in utilizing as a reactant 2,4,5,6-tetraaminopyrimidine; the acetylation of 2-aminoadenine in acetic acid and pyridine; the reaction of 2,6-diacetamidopurine with chlorosugar in ethylene chloride in the presence of a molecular sieve and subsequent deacetylation with methanolic sodium methoxide. Further, the diazotization step is carried out in a homogenous mixture of tetrahydrofuran and fluoboric acids. Finally, the O-benzyl groups are removed by the use of boron trichloride in ether.
本发明是一种改进的多步骤工艺,用于生产9-β-D-阿拉伯呋喃核糖基-2-氟腺嘌呤(2-F-AraA),并对Montgomery和Hewson的工艺进行了改进,J. Med. Chem.,12:498(1969)。该化合物是抗肿瘤疗法中的重要工具,已显示出对动物体内白血病L1210和P388的活性,同时也是一种强效的抗病毒剂。其治疗效果是因为2-F-AraA不是腺苷脱氨酶的底物,这与实验动物癌症中父化合物9-β-D-阿拉伯呋喃核糖腺嘌呤(araA)的活性相对立。通过本工艺制备2-F-AraA的一个优点是,基于氯代糖,产量大幅增加约400%。在本改进工艺中,差异在于利用2,4,5,6-四氨基嘧啶作为反应物;在乙酸和吡啶中对2-氨基腺嘌呤进行乙酰化;2,6-二乙酰基嘌呤与氯代糖在乙烯氯化物中在分子筛存在下反应,随后用甲醇钠甲醇醇解。此外,重氮化步骤在四氢呋喃和氟硼酸的均相混合物中进行。最后,通过使用三氯化硼在醚中去除O-苄基团。