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    • 22. 发明授权
    • Stereoselective process for alkyl phenylglycolic acids
    • 烷基苯基乙醇酸的立体选择性方法
    • US06376684B1
    • 2002-04-23
    • US09711776
    • 2000-11-13
    • Chris Hugh SenanayakePaul T. Grover
    • Chris Hugh SenanayakePaul T. Grover
    • C07D30793
    • C07D317/34C07C51/353C07C59/54
    • A process for preparing an alkyl phenylglycolic acid is disclosed. It follows the sequence of condensing a substituted acetaldehyde with mandelic acid to provide a 5-phenyl-1,3-dioxolan-4-one, which is condensed with an alkyl ketone or aldehyde to provide a 5-(1-hydroxyalkyl)-5-phenyl-1,3-dioxolan-4-one, which is dehydrated to a 5-(1-alkenyl)-5-phenyl-1,3-dioxolan-4-one. The 5-(1-alkenyl)-5-phenyl-1,3-dioxolan-4-one may be hydrolyzed and reduced to an &agr;-alkylphenylglycolic acid or the hydrolysis and reduction steps may be reversed. The process enables the production of single enantiomers of cyclohexylphenylglycolic acid (CHPGA). An analogous process for racemic CHPGA is disclosed employing racemic mandelic acid and acetone. Novel intermediates in the process are also disclosed.
    • 公开了一种制备烷基苯基乙醇酸的方法。 它遵循将取代的乙醛与扁桃酸缩合的顺序,得到5-烷基酮或醛缩合的5-苯基-1,3-二氧戊环-4-酮,得到5-(1-羟基烷基)-5 - 苯基-1,3-二氧戊环-4-酮,将其脱水至5-(1-烯基)-5-苯基-1,3-二氧戊环-4-酮。 可以将5-(1-烯基)-5-苯基-1,3-二氧戊环-4-酮水解并还原成α-烷基苯基乙醇酸,或者可以逆转水解和还原步骤。 该方法能够生产环己基苯基乙醇酸(CHPGA)的单一对映异构体。 公开了外消旋CHPGA的类似方法,其使用外消旋扁桃酸和丙酮。 还公开了该方法中的新型中间体。
    • 23. 发明授权
    • Stereoselective process for alkyl phenylglycolic acids
    • 烷基苯基乙醇酸的立体选择性方法
    • US06180823B2
    • 2001-01-30
    • US09187832
    • 1998-11-06
    • Chris Hugh SenanayakePaul T. Grover
    • Chris Hugh SenanayakePaul T. Grover
    • C07C5730
    • C07D317/34C07C51/353C07C59/54
    • A process for preparing an alkyl phenylglycolic acid is disclosed. It follows the sequence of condensing a substituted acetaldehyde with mandelic acid to provide a 5-phenyl-1,3-dioxolan-4-one, which is condensed with an alkyl ketone or aldehyde to provide a 5-(1-hydroxyalkyl)-5-phenyl-1,3-dioxolan-4-one, which is dehydrated to a 5-(1-alkenyl)-5-phenyl-1,3-dioxolan-4-one. The 5-(1-alkenyl)-5-phenyl-1,3-dioxolan-4-one may be hydrolyzed and reduced to an &agr;-alkylphenylglycolic acid or the hydrolysis and reduction steps may be reversed. The process enables the production of single enantiomers of cyclohexylphenylglycolic acid (CHPGA). An analogous process for racemic CHPGA is disclosed employing racemic mandelic acid and acetone. Novel intermediates in the process are also disclosed.
    • 公开了一种制备烷基苯基乙醇酸的方法。 它遵循将取代的乙醛与扁桃酸缩合的顺序,得到5-烷基酮或醛缩合的5-苯基-1,3-二氧戊环-4-酮,得到5-(1-羟基烷基)-5 - 苯基-1,3-二氧戊环-4-酮,将其脱水至5-(1-烯基)-5-苯基-1,3-二氧戊环-4-酮。 可以将5-(1-烯基)-5-苯基-1,3-二氧戊环-4-酮水解并还原成α-烷基苯基乙醇酸,或者可以逆转水解和还原步骤。 该方法能够生产环己基苯基乙醇酸(CHPGA)的单一对映异构体。 公开了外消旋CHPGA的类似方法,其使用外消旋扁桃酸和丙酮。 还公开了该方法中的新型中间体。