Process for preparing 2-halo-5-substituted pyridines
    1.
    发明授权
    Process for preparing 2-halo-5-substituted pyridines 失效
    制备2-卤代-5-取代吡啶的方法

    公开(公告)号:US5508410A

    公开(公告)日:1996-04-16

    申请号:US160037

    申请日:1993-11-30

    IPC分类号: C07D213/61

    CPC分类号: C07D213/61

    摘要: Described are preferred processes for preparing 2-halo-5-substituted pyridine compounds. Preferred processes can be conducted in a one-step, one-pot fashion, and involve the reaction of a formamide and a halogenating agent with a nitrile such as cis-2-pentenonitrile or with a combination of reactants including an aldehyde such as n-propionaldehyde and a nitrile or an amide. Preferred processes provide for convenient and advantageous preparations of 2-chloro-5-methylpyridine, which serves as an intermediate to important insecticidal compounds.

    摘要翻译: 描述了制备2-卤代-5-取代的吡啶化合物的优选方法。 优选的方法可以以一步一锅方式进行,并且涉及甲酰胺和卤化剂与腈如顺式-2-戊烯腈的反应或与包括醛的反应物的组合, 丙醛和腈或酰胺。 优选的方法提供方便和有利的2-氯-5-甲基吡啶的制备,其用作重要杀虫化合物的中间体。

    Process for preparing 2-halo-5-halomethylpyridines
    2.
    发明授权
    Process for preparing 2-halo-5-halomethylpyridines 失效
    制备2-卤代-5-卤代甲基吡啶的方法

    公开(公告)号:US5229519A

    公开(公告)日:1993-07-20

    申请号:US846898

    申请日:1992-03-06

    IPC分类号: C07D213/61

    CPC分类号: C07D213/61

    摘要: Disclosed are preferred processes for preparing a 2-halo-5-halomethylpyridine compound. The preferred processes involve cyclocondensing a 2-halo-2-halomethyl aldehyde or ketone of the formula (II) ##STR1## to form a 2-halo-2-halomethylpyridine compound of the formula (III) ##STR2## wherein X is Cl or Br, Y is a cyano group or an aminocarbonyl group, and R, R.sup.1, R.sup.2 and R.sup.3 are, independently, H or an organic radical which does not interfere with the cyclocondensation.

    摘要翻译: 公开了制备2-卤代-5-卤甲基吡啶化合物的优选方法。 优选的方法包括将式(II)的2-卤代-2-卤代甲基醛或酮环化为(II)以形成式(III)的2-卤代-2-卤代甲基吡啶化合物。 )其中X为Cl或Br,Y为氰基或氨基羰基,R,R1,R2和R3独立地为H或不影响环缩合的有机基团。

    Processes for producing 2-Halo-nicotinic acid derivatives and precursors
thereto
    3.
    发明授权
    Processes for producing 2-Halo-nicotinic acid derivatives and precursors thereto 失效
    2-卤代烟酸衍生物及其前体的制备方法

    公开(公告)号:US5493028A

    公开(公告)日:1996-02-20

    申请号:US179876

    申请日:1994-01-11

    摘要: Disclosed are preferred processes for the preparation of 2-halo-nicotinic acid derivatives of formula (IV): ##STR1## by cyclocondensation of a 4-halo-4-cyanocarbonyl compound of formula (III): ##STR2## wherein X is Cl or Br; Y is a carbonyl group and R.sup.1, R.sup.2 and R.sup.3 are each, independently, H, Cl, Br or an organic radical. Further preferred aspects include the preparation of the above-noted 4-halo-4-cyanocarbonyl compound via Michael addition of a 2-halonitrile with an .alpha.,.beta.-unsaturated aldehyde or ketone, and the preparation of the 2-halonitrile by redistribution of halogen between a 2,2-dihalonitrile and a parent nitrile.

    摘要翻译: 公开了通过式(III)的4-卤代-4-氰基羰基化合物的环化缩合制备式(IV)的2-卤代 - 烟酸衍生物的优选方法:图像(III):(III) )其中X为Cl或Br; Y是羰基,R 1,R 2和R 3各自独立地是H,Cl,Br或有机基团。 进一步优选的方面包括通过用α,β-不饱和醛或酮迈克尔加成2-卤代腈制备上述4-卤代-4-氰基羰基化合物,以及通过重新分配卤素制备2-卤代腈 在2,2-二卤代腈和母体腈之间。