Oxidative cyclisation of o-phenolic oxime-acid derivatives using phenyliodonium diacetate: Synthesis of spiroisoxazoline derivatives
作者:Masatoshi Murakata、Kohei Yamada、Osamu Hoshino
DOI:10.1016/0040-4020(96)00921-0
日期:1996.11
An efficient formation of spiroisoxazoline ring system by intramolecular oxidativecyclisation of o-phenolic oxime-esters and oxime-amides using phenyliodonium diacetate (PIDA) is described. The intramolecular oxidativecyclisation of various o-phenolic oxime-acid derivatives in acetonitrile at 0 °C proceeded smoothly to afford spiroisoxazolines in good yields. Synthesis of o-phenolic oxime-esters
Synthesis and Biological Evaluation of Purealin and Analogues as Cytoplasmic Dynein Heavy Chain Inhibitors
作者:Guangyu Zhu、Fanglong Yang、Raghavan Balachandran、Peter Höök、Richard B. Vallee、Dennis P. Curran、Billy W. Day
DOI:10.1021/jm051030l
日期:2006.3.1
Cytoplasmic dynein plays important roles in membrane transport, mitosis, and other cellular processes. A few small-molecule inhibitors of cytoplasmic dynein have been identified. We report here the first synthesis of purealin, a natural product isolated from the sea sponge Psammaplysilla purea, which is known to inhibit axonemal dynein. Also described are the first syntheses, by modular amide coupling reactions, of the natural product purealidin A (a component of purealin) and a small library of analogues. The library was examined for inhibition of cytoplasmic dynein heavy chain and cell growth. The compounds showed effective antiproliferative activity against a mouse leukemia cell line but selective activities against human carcinoma cell lines. Purealin and some of the analogues inhibited the microtubule-stimulated ATPase activity of recombinant cytoplasmic dynein heavy chain motor domain. The inhibitory effect of purealin was concentration dependent and uncompetitive, supporting the hypothesis that it does not compete with the binding of ATP.