Process for preparing haloketo acid derivatives
    1.
    发明授权
    Process for preparing haloketo acid derivatives 失效
    制备卤代酸衍生物的方法

    公开(公告)号:US5268501A

    公开(公告)日:1993-12-07

    申请号:US988432

    申请日:1992-12-09

    摘要: Process for preparing haloketo acid derivatives [I]: ##STR1## wherein R is H or C.sub.1-6 alkyl, and X is chlorine or bromine, which comprises reacting .beta.-oxo-acid ester [II]: ##STR2## wherein R.sup.1 is H or C.sub.1-6 alkyl, R.sup.2 is C.sub.1-5 alkyl or OR.sup.3 (R.sup.3 is C.sub.1-6 alkyl), and X is the same as above, with nitrosating agent [IV]:ONOR.sup.4 [IV]wherein R.sup.4 is H, alkyl, halogen or SO.sub.3 H to give 7-halo-2-hydroxyminoheptanoic acid ester [III]: ##STR3## wherein R.sup.1 and X are the same as above, following by reacting the product with aldehyde or ketone; and intermediates therefor, and process for preparing said intermediates. Said haloketo acid derivatives are useful as intermediate for synthesis of cilastatin, which is useful as medicament, especially as dehydropeptidase inhibitor.

    摘要翻译: 制备卤代羧酸衍生物的方法[I]:其中R是H或C 1-6烷基,X是氯或溴,其包括使β-氧代酸酯[II]: II]其中R 1是H或C 1-6烷基,R 2是C 1-5烷基或OR 3(R 3是C 1-6烷基),X与上述相同,与亚硝化剂[Ⅳ]:ONOR4 [Ⅳ]其中R4 是H,烷基,卤素或SO 3 H,得到7-卤代-2-羟基乙酸庚酯。[III]:其中R1和X与上述相同,然后使产物与醛或酮反应; 及其中间体,以及制备所述中间体的方法。 所述卤代酸衍生物可用作合成西司他丁的中间体,其可用作药物,特别是作为脱氢肽酶抑制剂。

    Process for preparing haloketo acid derivatives
    2.
    发明授权
    Process for preparing haloketo acid derivatives 失效
    制备卤代酸衍生物的方法

    公开(公告)号:US5202467A

    公开(公告)日:1993-04-13

    申请号:US651971

    申请日:1991-02-07

    摘要: Process for preparing haloketo acid derivatives [I]: ##STR1## wherein R is H or C.sub.1-6 alkyl, and X is chlorine or bromine, which comprises reacting .beta.-oxo-acid ester [II]: ##STR2## wherein R.sup.1 is C.sub.1-6 alkyl, R.sup.2 is C.sub.1-5 alkyl or OR.sup.3 (R.sup.3 is C.sub.1-6 alkyl), and X is the same as above, with nitrosating agent [IV]:ONOR.sup.4 [IV]wherein R.sup.4 is H, alkyl, halogen or SO.sub.3 H to give 7-halo-2-hydroxyiminoheptanoic acid ester [III]: ##STR3## wherein R.sup.1 and X are the same as above, followed by reacting the product with aldehyde or ketone; and intermediates therefor, and process for preparing said intermediates. Said haloketo acid derivatives are useful as intermediate for synthesis of cilastatin, which is useful as medicament, especially as dehydropeptidase inhibitor.

    Production of cyclopentenones by enzyme resolution
    6.
    发明授权
    Production of cyclopentenones by enzyme resolution 失效
    通过酶分解制备环戊烯酮

    公开(公告)号:US4957867A

    公开(公告)日:1990-09-18

    申请号:US055362

    申请日:1987-05-29

    IPC分类号: C12P7/42 C12P7/62

    CPC分类号: C12P7/42 C12P7/62

    摘要: A process for preparing an optically active cyclopentenone of the formula: ##STR1## wherein R is a hydrogen atom or a lower alkyl group and n is an integer of 4 to 8, which comprises contacting a dl-cyclopentenone ester of the formula: ##STR2## wherein R and n are each as defined above and R' is a lower alkyl group optionally substituted with halogen on an enzyme having a capability of hydrolyzing selectively either one of the d- or l-form isomer in the dl-cyclopentenone ester (II) in an aqueous medium for asymmetric hydrolysis.

    摘要翻译: 一种制备下式的光学活性环戊烯酮的方法:其中R是氢原子或低级烷基,n是4至8的整数,其包括使下式的dl-环戊烯酮与式 (II)其中R和n各自如上所定义,R'是任选被卤素取代的低级烷基,该酶具有选择性地水解d-或l-型异构体中的任一种的能力 dl-环戊烯酮酯(II)在不溶性水解的水性介质中。

    Phenylacetylene compound, liquid crystal composition, and liquid crystal element produced with the same
    7.
    发明授权
    Phenylacetylene compound, liquid crystal composition, and liquid crystal element produced with the same 失效
    苯乙炔化合物,液晶组合物,及其制造的液晶元件

    公开(公告)号:US06623810B2

    公开(公告)日:2003-09-23

    申请号:US09840983

    申请日:2001-04-25

    IPC分类号: C09K1942

    摘要: The present invention provides novel phenylacetylene compounds, liquid crystal compositions having a large refractive index anisotropy (&Dgr;n), and liquid crystal elements produced with the same. The liquid crystal composition contains at least one compound of formula (3A), and at least one compound selected from the group consisting of compounds of any one of formulae (3B) to (3C), wherein A1 to A12: alkyl group optionally substituted with F; R1, R2: H, F; A13 to A24: H, F; m: 0 or 1; Rings A to D: 1,4-phnylene, 1,4-cyclohexylene; R5, R6: H, F; Z1 to Z3: —COO—, —OCO—; b to d: 0 or 1 with b+c+d□1; B1 to B12: alkyl or alkoxy group; R7, R8: H, F:

    摘要翻译: 本发明提供了新的苯乙炔化合物,具有大的折射率各向异性(Deltan)的液晶组合物和由其生产的液晶元件。 液晶组合物含有至少一种式(3A)化合物和至少一种选自式(3B)至(3C)中任一项的化合物的化合物,其中A 1至A 12, :任选被F取代的烷基; R 1,R 2:H,F; A <13>至A 24:H,F; m:0或1; 环A至D:1,4-亚苯基,1,4-亚环己基; R 5,R 6:H,F; Z 1至Z 3:-COO - , - OCO-; b至d:0或1,b + c + d□1; B 1至B 12:烷基或烷氧基; R 7,R 8:H,F: