Synthesis of alpha-methyl, alpha-substituted amino acids
    3.
    发明授权
    Synthesis of alpha-methyl, alpha-substituted amino acids 有权
    α-甲基,α-取代氨基酸的合成

    公开(公告)号:US6043376A

    公开(公告)日:2000-03-28

    申请号:US342662

    申请日:1999-06-29

    IPC分类号: C07D263/18 C07D363/08

    CPC分类号: C07D263/18 Y02P20/55

    摘要: An improved process for making chiral, .alpha.-methylated, .alpha.-substituted amino acids of the formula I ##STR1## wherein Y is a hydrogen atom and R.sub.2 is the residue of a natural or unnatural amino acid, in which process an oxazolidinone of the formula II ##STR2## is formed by reacting a protected amino acid of the formula IA ##STR3## wherein Y is a protecting group, with an aldehyde of the formula RCHO, or an equivalent thereof, in the presence of a chlorinating agent and a Lewis acid.The group R.sub.2 is introduced into the oxazolidinone intermediate of formula II in a conventional manner, and subsequent hydrolysis and deprotection, both carried out in a conventional manner, yield the chiral, .alpha.-methylated, .alpha.-substituted amino acid.

    摘要翻译: 制备式I的手性,α-甲基化,α-取代氨基酸的改进方法,其中Y是氢原子,R 2是天然或非天然氨基酸的残基,其中形成式II的恶唑烷酮 通过在氯化剂和路易斯酸的存在下使式IA的保护的氨基酸(其中Y是保护基团)与式RCHO的醛或其等同物反应。 以常规方式将基团R2引入式II的恶唑烷酮中间体,并且以常规方式进行的随后的水解和脱保护得到手性,α-甲基化的α-取代的氨基酸。