Enzymatic Synthesis of New Pyridine Nucleosides. Clitidine and Its Amide Derivative
作者:Shuichi Tono-oka、Yasuhiko Sasahara、Akio Sasaki、Haruhisa Shirahama、Takeshi Matsumoto、Shichiro Kakimoto
DOI:10.1246/bcsj.54.212
日期:1981.1
Two β-NAD-analogs were prepared utilizing a base-exchange reaction catalyzed by pig-brain NADase. These analogs were proved to contain a methyl 1,4-dihydro-4-iminonicotinate and a 1,4-dihydro-4-iminonicotinamide moiety. By successive hydrolytic degradations of these analogs, 1,4-dihydro-4-iminopyridine β-ribosides with 3-carboxyl and 3-carbamoyl groups were prepared in good yields. The former compound was identical with clitidine, a toxic pyridine nucleoside recently isolated from a toadstool. The present synthesis confirmed the 1,4-dihydro-4-imino β-riboside structure of clitidine. Preliminary biological tests showed that the 3-carbamoyl compound was more toxic than clitidine, suggesting that the amide derivative of clitidine is an essential toxic substance in the toadstool.
两种β-NAD类似物是通过猪脑NAD酶催化的碱基交换反应制备的。这些类似物被证实含有甲基1,4-二氢-4-亚氮喹啉酸盐和1,4-二氢-4-亚氮喹啉胺基团。通过对这些类似物进行连续的水解降解,获得了具有3-羧基和3-氨基甲酰基的1,4-二氢-4-亚氮吡啶β-核糖苷,产率很好。前一种化合物与最近从毒蘑菇分离出的毒性吡啶核苷克利替定相同。本次合成确认了克利替定的1,4-二氢-4-亚氮β-核糖苷结构。初步生物测试表明,3-氨基甲酰基化合物的毒性高于克利替定,这表明克利替定的酰胺衍生物是在毒蘑菇中的一种重要毒性物质。