105151-39-1Relevant articles and documents
Synthesis of diethyl 5-Ethyl-2,3-Pyridinedicarboxylate
Cheng, Chunsheng,Ma, Xiaohua,Wei, Zhenyun
, p. 918 - 920 (2014)
Diethyl 5-ethyl-2,3-pyridinedicarboxylate was synthesized using ammonium acetate as the nitrogen source. The optimum process conditions were obtained by exploring the reaction mechanism and researching the effects of reactant ratio, reaction temperature and solvent amount on the yield from all sides. Diethyl 5-ethyl-2,3-pyridinedicarboxylate yield was 98 % analysis by HPLC and the overall yield 96.8 % calculated by 2-chloro-3-oxo-succinic acid diethyl ester. The optimum process has the advantages of available initial material, simple waste-water treatment and environmental friendliness which are more applicable for industrial production.
Preparation method of 5-alkyl substituted pyridine-2,3-diformate diester compound
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Paragraph 0043-0057; 0061-0063; 0067-0078, (2020/07/12)
The invention provides a preparation method of a 5-alkyl substituted pyridine-2,3-diformate diester compound. Pyridine dicarboxylic acid, alcohol, an acid catalyst and a solvent are added into a reactor and heated to carry out reactions; water diversion is performed through rectification, wherein the addition amount of alcohol is 4-10 times of that of pyridine dicarboxylic acid (mole number), andthe addition amount of acid is 1-6 times of that of pyridine dicarboxylic acid (proton mole number). The preparation method is simple in process flow, high in product content and high in yield. Moreover, by controlling the process conditions, no byproduct is generated basically, the raw materials can be recycled repeatedly, and the three-waste pollution is small.
Preparation method for imidazolinone compound
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Paragraph 0035-0037, (2019/03/29)
The invention provides a preparation method for an imidazolinone compound, belongs to the technical field of organic synthesis, and can solve the problems that a large amount of wastewater is producedand the content of impurities in the product is high in the existing process for preparing the imidazolinone compound. According to the preparation method for the imidazolinone compound provided by the invention, a solution of 5-alkyl pyridine-2,3-phthalate is synthesized from ammonium carbonate; the steps of adding water, extracting, refining and the like are avoided in post-treatment; the obtained solution of the 5-alkyl pyridine-2,3-phthalate is used for subsequent reaction; and the wastewater is not produced. Then, a catalyst is added in the process of preparing 5-alkyl pyridine-2,3-dimethylbenzene anhydride, and the pH is controlled in the subsequent reaction process, so that the production of the impurities can be avoided, and the product purity is improved. The imidazolinone compound prepared by the method provided by the invention can be used as a high-efficiency herbicide.
Process for preparing pyridine and quinoline derivatives
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, (2016/06/15)
The present invention pertains to a method of preparing substituted and unsubstituted N-hydroxy-2-aminobutane diacid derivatives which can be dehydrated to 2-aminobut-2-ene dioic acid derivatives, which can be subsequently converted to pyridine and quinoline derivatives.
Process for the preparation of substituted and unsubstituted-2,3-pyridinedicarboxylates from chloromaleate or chlorofumurate or mixtures thereof
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, (2008/06/13)
There is provided a process for the preparation of dialkyl pyridinedicarboxylate compounds and derivatives thereof by reacting a dialkyl chloromaleate or chlorofumarate or a mixture thereof with an ammonium salt optionally in the presence of ammonia and an appropriately substituted α,β-unsaturated aldehyde or ketone.
Process for preparing pyridinecarboxylic acid derivatives
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, (2008/06/13)
The present invention pertains to a method of preparing substituted and unsubstituted N-hydroxy-2-aminobutane diacid derivatives. The invention also pertains to the use of N-hydroxy-2-aminoethane derivatives (including the N-hydroxy-2-aminobutane diacid derivatives) in the preparation of pyridine derivatives.
Process for the purification of 2,3-pyridine and quinolinedicarboxylic acid diester compounds
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, (2008/06/13)
The present invention provides a process for the purification of 2,3-pyridine and quinolinedicarboxylic acid diester compounds via extraction with a mineral acid.
(2-imidazolin-2-yl) fused heteropyridine compounds, intermediates for the preparation of and use of said compounds as herbicidal agents
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, (2008/06/13)
There are provided novel (2-imidazolin-2-yl) fused heteropyridine compounds, and intermediate compounds for the preparation thereof, and a method for controlling a wide variety of annual and perennial plant species therewith.
Process for the preparation of dialkyl 2,3-pyridinedicarboxylate and derivatives thereof from an α,β-unsaturated oxime and an aminobutenedioate
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, (2008/06/13)
There is provided a convenient process for the preparation of commercially useful pyridinedicarboxylate compounds by the condensation of an α, β-unsaturated oxime and an aminomaleate or aminofumarate or mixtures thereof.
Process for the preparation of dialkyl pyridine-2,3-dicarboxylate and derivatives thereof from dialkyl dichlorosuccinate
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, (2008/06/13)
There is provided a process for the preparation of substituted and unsubstituted-2,3-pyridinedicarboxylate compounds by reacting a dialkyl dichlorosuccinate with a dehydrohalogenating agent, an ammonia source and an appropriately substituted α,β-unsaturated aldehyde or ketone.
