申请人:Kabushiki Kaisha Yakult Honsha
公开号:US04473692A1
公开(公告)日:1984-09-25
New Camptothecin derivatives possessing high anti-tumor activity with slight toxicity, represented by the general formula: ##STR1## wherein R.sup.1 is a hydrogen atom, an alkyl group, a hydroxyl group, an alkoxy group or an acyloxy group, R.sup.2 for a hydrogen atom, an alkyl group, an aralkyl group, a hydroxymethyl group, a carboxymethyl group or an acyloxymethyl group, and R.sup.3 is the grouping --XR' (where R' is a hydrogen atom, an alkyl group or an acyl group and X is an oxygen atom or a sulfur atom), a nitro group, an amino group, an alkylamino group, an acylamino group or a halogen atom, with the proviso that when both of R.sup.1 and R.sup.2 are hydrogen atoms, R.sup.3 should not be a hydroxyl group, methoxy group or acetoxy group. These new camptothecin derivatives are prepared by treating a 5-R.sup.1 -7-R.sup.2 -camptothecin derivative with a peroxidant and then reacting the resultant 5-R.sup.1 -7-R.sup.2 -camptothecin-1-oxide with an active hydrogen compound under irradiation of UV-rays or by catalytically hydrogenating the ring B of camptothecin in a solvent, treating the resultant tetrahydro product with an acylating agent, introducing a nitro group into the 10-position of the acylated product by the reaction with nitric acid, splitting off the acyl group in the 10-nitro product by hydrolysis and treating the hydrolyzed tetrahydro product with an oxidizing agent for dehydrogenation, and if desired, reducing the nitro group in the resulting product to an amino group and modifying the amino group by N-alkylation, N-acylation or by diazotization followed by hydrolysis or the Sandmeyer reaction, before or after the oxidation of the 10-nitro-tetrahydro product.
新的喜树碱衍生物具有高抗肿瘤活性,毒性轻微,其一般式表示为:##STR1##其中R.sup.1为氢原子、烷基、羟基、烷氧基或酰氧基,R.sup.2为氢原子、烷基、芳基烷基、羟甲基、羧甲基或酰氧甲基,R.sup.3为基团--XR'(其中R'为氢原子、烷基或酰基,X为氧原子或硫原子),亚硝基、氨基、烷基氨基、酰胺基或卤素原子,但是当R.sup.1和R.sup.2均为氢原子时,R.sup.3不应为羟基、甲氧基或乙酰氧基。这些新的喜树碱衍生物是通过将5-R.sup.1-7-R.sup.2-喜树碱衍生物与过氧化剂处理,然后在紫外线照射下将所得的5-R.sup.1-7-R.sup.2-喜树碱-1-氧化物与活性氢化合物反应,或者在溶剂中催化氢化喜树碱的B环,处理所得的四氢产物与酰化剂反应,通过与硝酸反应将亚硝基引入酰化产物的10位,通过水解将10-亚硝基产物中的酰基分离,并将水解后的四氢产物与氧化剂处理以脱氢,如有需要,将所得产物中的亚硝基还原为氨基,并通过N-烷基化、N-酰化或通过重氮化后水解或桑迈尔反应修饰氨基团,在氧化10-亚硝基四氢产物之前或之后。