Synthesis of the Methyl Ester of Tritium-labeled AK-toxin I, a Host-specific Toxin Produced by<i>Alternaria alternata</i>Japanese Pear Pathotype
作者:Masakazu OKADA、Hisashi MIYAGAWA、Tamio UENO
DOI:10.1271/bbb.63.1253
日期:1999.1
AK-toxin I, a host-specific toxin to Japanese pear (Pyrus serotina), was synthesized as its methyl ester from three precursor fragments: conjugated diene-carboxylic acid, chiral epoxyalcohol and β-methylphenylalanine. The epoxyalcohol fragment was derived from D-fructose, in which effective homologation of the hemiacetal carbon to alkyne by using dimethyl 1-diazo-2-oxopropylphosphonate was the key
AK-毒素I是日本梨(Pyrus serotina)的一种宿主特异性毒素,是由其三个前体片段(共轭二烯-羧酸,手性环氧醇和β-甲基苯基丙氨酸)合成的甲酯形式的。环氧醇片段衍生自D-果糖,其中通过使用1-重氮-2-氧代丙基膦酸二甲酯使半缩醛碳有效同化为炔烃是关键反应。通过重复的Wittig反应制备二烯-羧酸片段,并通过Stille反应将其与环氧醇片段结合。用立体化学纯的β-甲基苯基丙氨酸片段酯化合并的产物,得到目标化合物。该方法用于制备tri标记的AK毒素I的甲酯,其比放射性为213 GBq / mmol。