Preparation of cyclopropanecarboxylic acid esters
    1.
    发明授权
    Preparation of cyclopropanecarboxylic acid esters 失效
    制备环丙烷羧酸酯

    公开(公告)号:US4299972A

    公开(公告)日:1981-11-10

    申请号:US164902

    申请日:1980-07-01

    CPC分类号: C07C69/743

    摘要: A process is disclosed for the preparation of an optically active or racemic cyclopropanecarboxylic acid of the formula (I) ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and each is lower alkyl or halogen;R is a member of a group which contains various cyclic structures as set forth in the specification,the .about. valency bond represents .alpha.- and/or .beta.-configuration;the -- valency bond represents .beta.-configuration,which comprises reacting an optically active or racemic cyclopropanecarboxylic acid of the formula (VII) ##STR2## with a dimethyl-methylidene-ammonium salt of the formula (VIII) ##STR3## wherein X is halogen or lower alkoxy andY.sup.- is a halide or lower alkylsulfate ion in an anhydrous, inert organic solvent, and sebsequently reacting a dimethyl-acloxy-methylidene-ammonium salt thus obtained with an optically active, inactive or racemic alcohol of the formulaR--OHwithout isolation, in the presence of an organic base.

    摘要翻译: 公开了制备式(I)的光学活性或外消旋环丙烷羧酸的方法,其中R 1和R 2相同或不同,各自为低级烷基或卤素; R是包含说明书中所列的各种环状结构的基团的成员,差异化合价键代表α-和/或β-构型; 价键表示β构型,其包括使式(VII)的光学活性或外消旋环丙烷羧酸与式(VIII)的二甲基亚甲基铵盐反应(VIII) )其中X是卤素或低级烷氧基,Y-是在无水惰性有机溶剂中的卤化物或低级烷基硫酸根离子,然后使由此得到的二甲基 - 酰氧基 - 亚甲基 - 铵盐与光学活性的无活性或外消旋醇反应 式R-OH不分离,在有机碱的存在下。