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和轻微毒性,其通式表示为:##STR1##其中R.sup.1是氢原子、烷基、羟基、烷氧基或酰氧基,R.sup.2是氢原子、烷基、芳基烷基、羟甲基、羧甲基或酰氧甲基,R.sup.3是基团--XR'(其中R'是氢原子、烷基或酰基,X是氧原子或硫原子),硝基基团、氨基基团、烷基氨基基团、酰基氨基基团或卤素原子,但当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用过氧化剂处理5-R.sup.1-7-R.sup.2-喜树碱衍生物,然后在紫外线照射下用活性氢化合物反应所得的5-R.sup.1-7-R.sup.2-喜树碱-1-氧化物或通过在溶剂中催化氢化喜树碱的B环,用酰化剂处理所得的四氢产物,通过与硝酸反应在酰化产物的10位引入硝基基团,通过水解分解10-硝基产物中的酰基,然后用氧化剂处理水解的四氢产物进行脱氢反应制备而成的,如果需要,在10-硝基-四氢产物中还可以还原硝基基团为氨基基团,并通过N-烷基化、N-酰基化或重氮化后水解或桑迈尔反应来修饰氨基基团。