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, a halogen atom or an alkyl group with 1-4 carbon atoms and X is a chlorine atom or --NR.sup.2 R.sup.3 where R.sup.2 and R.sup.3 are the same or different and each represents a hydrogen atom, a substituted or unsubstituted alkyl group with 1-4 carbon atoms or a substituted or unsubstituted carbocyclic or heterocyclic group, with the proviso that when both R.sup.2 and R.sup.3 are the substituted or unsubstituted alkyl groups, they may be combined together with the nitrogen atom, to which they are bonded, to form a heterocyclic ring which may be interrupted with --O--, --S-- and/or >N--R.sup.4 in which R.sup.4 is a hydrogen atom, a substituted or unsubstituted alkyl group with 1-4 carbon atoms or a substituted or unsubstituted phenyl group and wherein the grouping --O--CO--X is bonded to a carbon atom located in any of the 9-, 10- and 11-positions in the ring A of camptothecin, as well as an ammonium salt or an alkali metal salt thereof. These new camptothecin derivatives are prepared by reacting a 7-R.sup.1 -camptothecin derivative having a hydroxyl group in any of the 9-, 10- and 11-positions on the ring A thereof with phosgen and then reacting, if necessary, the resultant 7-R.sup.1 -camptothecin derivative having a chlorocarbonyloxy group in the same position on the ring A thereof with an amine HNR.sup.2 R.sup.3 or by reacting a 7-R.sup.1 -camptothecin derivative having a hydroxyl group in any of the 9-, 10- and 11-positions on the ring A thereof with a carbamoyl chloride Cl-CONR.sup.2 R.sup.3.
具有高抗肿瘤活性和轻微毒性的新
喜树碱衍
生物,由通式表示:##STR1## 其中R.sup.1是氢原子,卤素原子或1-4个碳原子的烷基,X是
氯原子或--NR.sup.2 R.sup.3,其中R.sup.2和R.sup.3相同或不同,每个代表氢原子,取代或未取代的1-4个碳原子的烷基或取代或未取代的环烷基或杂环基,但当R.sup.2和R.sup.3均为取代或未取代的烷基时,它们可以与它们连接的氮原子结合在一起形成一个杂环,该杂环可以被--O--,--S--和/或>N--R.sup.4中断,其中R.sup.4是氢原子,取代或未取代的1-4个碳原子的烷基或取代或未取代的苯基,且--O--CO--X基团与
喜树碱的A环中的任何9-、10-和11-位置之一的碳原子连接,以及其
氨盐或碱
金属盐。这些新的
喜树碱衍
生物是通过将在其A环上的任何9-、10-和11-位置具有羟基的7-R.sup.1-
喜树碱衍
生物与
光气反应,然后必要时将在其A环上同一位置具有
氯羰氧基的7-R.sup.1-
喜树碱衍
生物与胺HNR.sup.2 R.sup.3反应,或通过将在其A环上任何9-、10-和11-位置具有羟基的7-R.sup.1-
喜树碱衍
生物与
氯甲酰氯Cl-CONR.sup.2 R.sup.3反应而制备的。