Semisynthetic pyrrolizidine alkaloid N-oxide antitumor agents. Esters of heliotridine
作者:Leon H. Zalkow、Jan A. Glinski、Leslie T. Gelbaum、David Moore、Deborah Melder、Garth Powis
DOI:10.1021/jm00403a008
日期:1988.8
lbutyric acid were prepared, converted into their N-oxides, and compared with the corresponding C-9 monoesters of retronecine in the in vivo P388 lymphocytic leukemia screen. Relative in vitro cytotoxicities of some of the free bases and their corresponding N-oxides were also measured against the A204 rhabdomyosarcoma cell line by using the soft agar colony forming assay. Stereochemistry at C-7 of
制备了带有(S)-(+)和(R)-(-)-2-羟基-2-羟基丁酸的Heliotridine的C-9和C-7单酯以及C-7,C-9二酯,将其转化为在体内P388淋巴细胞白血病筛查中,将其N氧化物与相应的逆转录酶C-9单酯进行比较。通过使用软琼脂菌落形成试验,还测量了一些游离碱及其相应的N-氧化物对A204横纹肌肉瘤细胞系的相对体外细胞毒性。烟碱的C-7和烟酸的C-2'的立体化学似乎对该系统的抗肿瘤活性具有显着影响。在Heliotridine系列中,烟酸的构型对碳二咪唑酯化反应中的位点选择性(C-7与C-9)有显着影响。提供了该位点选择性的解释。