Improved synthetic access to the β,γ-enol ether amino acids, L-2-amino-4-methoxy-trans-but-3-enoic acid and l-2-amino-4-methoxy--but-3-enoic acid
作者:Vitauts Alks、Janice R. Sufrin
DOI:10.1016/s0040-4039(00)98044-4
日期:1990.1
to L-2-amino-4-methoxy--but-3-enoic acid, exclusive of the - isomer, has been developed. The key step is direct formation of a -enol ether derivative from the corresponding dimethylacetal, by refluxing in CCl4, in the presence of hexamethyldisilazane and Me3SiI. The isomeric L- amino acid could be accessed from this route by isomerizing the intermediate, methyl DL-2-acetamido-2-amino-4-methoxy--but-3-enoate
已开发出排除异构体的L-2-氨基-4-甲氧基-丁-3-烯酸的合成途径。关键步骤是在六甲基二硅氮烷和Me 3 SiI存在下,通过在CCl 4中回流,从相应的二甲基缩醛直接形成-enol醚衍生物。同分异构的L-氨基酸可从该路线由异构化中间,甲基访问DL-2-乙酰氨基-2-氨基-4-甲氧基-丁-3-烯酸甲酯在217℃,得到-在一个1:1的混合物10的比例。