Process for the preparation of R-(-)-carnitine
    7.
    发明授权
    Process for the preparation of R-(-)-carnitine 失效
    制备R - ( - ) - 肉碱的方法

    公开(公告)号:US06316667B2

    公开(公告)日:2001-11-13

    申请号:US09740806

    申请日:2000-12-21

    IPC分类号: C07C22900

    摘要: R-(−)-carnitine is prepared by (a) conversion of (S)-3-hydroxy-4-butyrolactone [1] to alkyl (S)-4-halogen-3-hydroxy-butyrate [2] by reaction with a linear or branched C1-C7 alcohol (b), substitution of a CN group for the halogen of compound [2] to yield the alkyl ester of (R)-4-cyano-3-hydroxybutyric acid [3], (c) conversion of alkyl ester [3] to yield (R)-4-cyano-3-hydroxybutyramide [4], (d) cyclization of compound [4] to yield (R)-5-(cyanomethyl)-2-oxazolidone [5] via conversion of the amide function to isocyanate, (e) hydrolysis of compound [5] to yield (R)-4-amino-3-hydroxybutyric acid [6], and finally (f) methylation of the amino group of compound [6] to yield the end product (R)-carnitine.

    摘要翻译: 通过(a)通过与(S)-3-羟基-4-丁内酯[1]转化为(S)-4-卤素-3-羟基 - 丁酸烷基酯[2]的方法制备R - ( - ) - 肉碱 直链或支链C 1 -C 7醇(b),CN基团取代化合物[2]的卤素,得到(R)-4-氰基-3-羟基丁酸的烷基酯[3],(c) 烷基酯[3]转化成(R)-4-氰基-3-羟基丁酰胺[4],(d)化合物[4]环化得到(R)-5-(氰基甲基)-2-恶唑烷酮[5 ]通过将酰胺官能团转化为异氰酸酯,(e)化合物[5]的水解产生(R)-4-氨基-3-羟基丁酸[6],最后(f)化合物[ 6],得到最终产物(R) - 肉碱。