除草効果がある置換された3-ヒドロキシ-4-アリール-5-オキソピラゾリン誘導体の製造方法

Title:

除草効果がある置換された3-ヒドロキシ-4-アリール-5-オキソピラゾリン誘導体の製造方法

Document Type and Number:

Japanese Patent JP5411319

Kind Code:

B2

Abstract:

The present invention provides a process for the production of intermediate compounds of formula (I), wherein the substituents are as defined herein. The process comprises reacting a substituted aniline with aqueous HX, followed by removal of water by azeotropic distillation and diazotization and pyrolysis with an organic nitrite at elevated temperatures in the absence of a copper catalyst. Alternatively, gaseous HX can be used to substitute aqueous HX in the process. Consequently, a step of water removal by azeotropic distillation can be eliminated. The intermediate compounds of formula I are suitable as intermediates in the preparation of herbicidally active 3-hydroxy-4-aryl-5-oxopyrazoline derivatives.

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Inventors:

One, Rinfa
Dolville, Christine Anderson
Frankie Lee, Odom

Application Number:

JP2012127185A

Publication Date:

February 12, 2014

Filing Date:

June 04, 2012

Export Citation:

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Assignee:

Syngenta Partitions Akchen Gesell Shaft
Syngenta Limited

International Classes:

C07D231/34; C07C17/093; C07C17/383; C07C25/02; C07D231/32

Domestic Patent References:

JP1283230A
JP2003502403A
JP10512248A

Attorney, Agent or Firm:

Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Satoshi Deno

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