Intermediates for the synthesis of carboxylic acids
    63.
    发明授权
    Intermediates for the synthesis of carboxylic acids 失效
    用于合成羧酸的中间体

    公开(公告)号:US4824970A

    公开(公告)日:1989-04-25

    申请号:US891348

    申请日:1986-07-31

    CPC分类号: C07D317/34 C07C51/00

    摘要: Compounds are described of formula ##STR1## in which: Ar represents a aryl, possibly substituted;R represents a C.sub.1 -C.sub.4 alkyl;R' represents a hydroxyl, an alkoxy, an amino group possibly mono or di-alkyl substituted, or an O-M+ group where M+ represents the cation of an alkaline metal;X represents a hydrogen, chlorine, bromine or iodine atom, a hydroxyl, or an acyloxy, alkylsulphonyloxy or arylsulphonyloxy group.The compounds of formula I can be easily transformed into alphaarylalkanoic acids of formula ##STR2## in which Ar and R have the aforesaid meanings.

    摘要翻译: 化合物描述为式(I),其中:Ar表示可能被取代的芳基; R代表C1-C4烷基; R'表示羟基,烷氧基,可能单或二烷基取代的氨基,或者M +表示碱金属阳离子的O-M +基团; X表示氢,氯,溴或碘原子,羟基或酰氧基,烷基磺酰氧基或芳基磺酰氧基。 式I化合物可以容易地转化成其中Ar和R具有上述含义的式(III)的α-芳基链烷酸。

    Process for the preparation of naproxene nitroxyalkylesters
    70.
    发明授权
    Process for the preparation of naproxene nitroxyalkylesters 有权
    制备萘普生硝基烷基酯的方法

    公开(公告)号:US07238829B2

    公开(公告)日:2007-07-03

    申请号:US10625558

    申请日:2003-07-24

    IPC分类号: C07C203/10

    CPC分类号: C07C201/02 C07C203/04

    摘要: A process for obtaining nitroxyalklesters of the 2(S)(6-methoxy-2-naphthyl)-propanoic acid having an enantiomeric excess higher than or equal to 95%, preferably higher than or equal to 98%, characterized in that an halide of the 2-(S)-(6 methoxy-2-naphthyl)propanoic acid of formula A-Hal, wherein A is the acid acyl residue, is reacted in an inert organic solvent with an aliphatic nitroxyalkanol HO—Y—ONO2, wherein Y is a C2-C20 alkylene or a cycloalkylene from 3 to 8 carbon atoms, or an alkylene as defined containing a cycloalkylene as defined, in the presence of an inorganic base.

    摘要翻译: 一种获得具有高于或等于95%,优选高于或等于98%的对映异构体过量的2(S)(6-甲氧基-2-萘基) - 丙酸的硝基螺旋体的方法,其特征在于, 其中A是酸酰基残基的式A-Hal的2-(S) - (6甲氧基-2-萘基)丙酸在惰性有机溶剂中与脂族硝基链烷醇HO-Y-ONO 2,其中Y是C 2 -C 20亚烷基或3至8个碳原子的亚环烷基,或如所定义的含有如所定义的亚环烷基的亚烷基 在无机碱存在下进行。