1369852-71-0Relevant academic research and scientific papers
PROCESS FOR MAKING AN ISOXAZOLINE COMPOUND AND INTERMEDIATE THEREOF
-
, (2022/02/05)
The present disclosure provides processes for making enantiomerically pure isoxazoline compounds of formula (1), (1). The present disclosure also provides processes for making enantiomerically pure isoxazoline compounds of formula (1) characterized by improving the enantiomeric purity of 3-methyl-5-[(5S)-5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4H-isoxazol-3-yl]thiophene-2-carboxylic acid by crystallization.
Preparation method of isoxazoline insecticide
-
Paragraph 0032; 0036; 0037; 0038, (2021/03/11)
The invention relates to a preparation method of an isoxazoline insecticide, which relates to the technical field of chemical industry, and comprises the following steps: 1) coupling reaction: mixingan intermediate 1 with nitromethane in a solvent, adding a palladium catalyst and a ligand to carry out catalytic coupling, reacting, and separating and purifying to obtain an intermediate 2; 2) cyclization reaction: mixing the intermediate 2 and an intermediate 3, adding the mixture into a mixed solution of a dehydrating agent and alkali, carrying out full cyclization reaction, and purifying to obtain an intermediate 4; and 3) condensation reaction: mixing the intermediate 4 and an intermediate 5, adding a condensing agent, carrying out full condensation reaction, and carrying out separationand purification to obtain an isoxazoline compound 6. The method has the advantages of short reaction route, accessible raw materials, fewer three wastes and high purity of the purified product, and is suitable for industrial production.
PROCESS FOR THE ENANTIOMERIC ENRICHMENT OF DIARYLOXAZOLINE DERIVATIVES
-
, (2014/07/07)
The present invention concerns a process for the manufacture of the S-enantiomer of a compound of formula (I) wherein the variables are as defined in the specification and claims, comprising the steps of (A) separating a racemic compound of formula (II) wherein R', R and R' and Y are as defined above and Z is Q; or is halogen, amino, carboxy (-COOH); into the enantiomers and collecting the S-enantiomer; (B) if Z is other than Q, converting the S-enantiomer of formula (II) from step (A) to a S- enantiomer of formula (I); (C) racemizing the R-enantiomer of formula (II) from step (A) in a reaction medium comprising a base and an aprotic organic solvent at a temperature of from 30°C to 150°C, and (D) subjecting the racemate from step (C) to a further manufacturing cycle comprising step (A) and optionally (B). Accordingly, a cyclic process is provided, wherein the undesired enantiomer of a first enantiomer separation step is racemized and then phased in a further enantiomer separation step.
