8 results about "Chrysanthemic acid" patented technology

The application discloses a kind of carolic acid and preparation method thereof, and specifically relates to the field of medical technology.The method comprises the following steps: stirring catalyst H2WO4 / C with hydrogen peroxide, then adding dichloro chrysanthemic acid ethyl ester; oil bath heating is carried out, reaction temperature is controlled, repeated reflux is carried out, and oxidation reaction is carried out; after the reaction, homogeneous transparent solution is filtered, extracted, and subjected to reduced pressure distillation to obtain carolic acid product.In the application, when catalyzing and oxidizing dichloro chrysanthemic acid ethyl ester, a high-activity H2WO4 / C heteropoly acid is used as a catalyst, the reaction scheme is optimized, the selectivity of the reaction is greatly improved, the number of cycles of the catalyst is increased, and after 20 cycles of the new catalyst, the catalyst activity does not decrease obviously.Furthermore, due to the great improvement of selectivity, the loss of product is reduced, and the yield is improved.

The invention discloses a syringate compound capable of preventing and treating barn pests as well as a preparation method and application of the syringate compound. The syringate compound has the following molecular structure expression, and according to the design, the light stability is enhanced by utilizing a rigid cyclic structure of chrysanthemic acid, and the CarE activity can be inhibited through a propenyl side chain of eugenol, so that self metabolism inactivation of pyrethrin is blocked; .

The application discloses an esterase whole cell catalyst and preparation and application thereof, the esterase whole cell catalyst can express a carboxylic acid esterase mutant disclosed in the application, the carboxylic acid esterase mutant is subjected to the following mutations on the amino acid sequence shown in SEQ ID NO. 1: the glycine at the 236th position is replaced by valine, the arginine at the 417th position is replaced by phenylalanine, and the threonine at the 545th position is replaced by alanine. The application effectively solves the problems of low catalytic activity of a warming catalyst for resolving methyl chrysanthemate and poor product tolerance in the prior art. The esterase whole cell catalyst of the application significantly improves the activity of selectively resolving methyl chrysanthemate to prepare dextro-trans chrysanthemic acid, and the optical purity can reach more than 99%. Moreover, the carboxylic acid esterase mutant disclosed in the application can be expressed in a soluble form in cell supernatant, can be produced in a large scale through microbial fermentation, has mild reaction conditions, and is simple to operate, and is more suitable for industrial production.

The invention relates to the field of organic synthesis, relates to a method for splitting trans-2, 6-dimethyl-1-indene amine, and in particular relates to a method for obtaining (1R, 2S)-2, 6-dimethyl-1-indene amine by splitting trans-2, 6-dimethyl-1-indene amine by utilizing a chiral inulin compound. The method comprises the following steps: reacting a chiral inulin compound with trans-2, 6-dimethyl-1-indene amine under a heating condition to generate salt, cooling and crystallizing, and hydrolyzing the obtained solid under an alkaline condition to obtain (1R, 2S)-2, 6-dimethyl-1-indene amine. The chiral chrysanthemic acid compound is adopted as a resolving agent, a traditional amino acid derivative resolving agent is replaced, good durability and stability are achieved, and by optimizing resolving conditions and technological parameters, a universal solvent which is widely applied in the market, low in price and easy to obtain serves as a solvent system, and the resolution efficiency is improved. The resolution with high yield (greater than 97%) and high optical purity (ee value greater than 98%) is realized.

The present application relates to the composition containing the biologically effective amount of compound I and fluensulfamide or KII-9396, and the method for preventing and treating pests in agronomic and non-agronomic environment. The compound I has synergistic effect with fluensulfamide or KII-9396, can improve the pest control effect, reduce the application amount, reduce the use frequency, and reduce the use cost.

The invention belongs to the technical field of novel pyrethrum compounds, and provides four insecticidal active compounds in pyrethrum flowers as well as a preparation method and application thereof. The insecticidal active compound provided by the invention has a structure as shown in the specification. The Tanacetute A and the Tanacetute B belong to lignan compounds, the Tanacetute C belongs to monoterpene ester compounds, and the Tanacetute D belongs to sesquiterpenoids. The TanacetumA-D enriches the variety of natural pyrethrin, shows remarkable insecticidal activity on aphids, especially on corn aphids, and is of great significance to development of novel biological insecticides. The invention also provides a preparation method of the insecticidal active compound provided by the technical scheme. The preparation method provided by the invention is simple to operate. According to the method, the pyrethrum flowers are used as raw materials for extraction, so that the resource utilization of the pyrethrum flowers is improved.

The present application relates to a kind of composition containing fluorine mite double ether or KII-9396 and its application.The compound I has synergistic effect with fluorine mite double ether or KII-9396, can improve pest control effect, reduce application amount, reduce use frequency, reduce use cost.

The invention belongs to the technical field of bioengineering, and particularly relates to an enzyme-catalyzed condensation reaction method and application of the enzyme-catalyzed condensation reaction method in efficient synthesis of pesticides. The condensation reaction method comprises the steps that a biocatalyst containing an EstA enzyme mutant reacts in a reaction system containing substrates for enough time so as to convert the substrates into cypermethrin, the substrates are dichlorochrysanthemic acid and alpha-cyano-m-phenoxybenzyl alcohol, and compared with an amino acid sequence shown in SEQ ID NO: 1, the amino acid sequence of the EstA enzyme mutant is as shown in SEQ ID NO: 1, and the amino acid sequence of the EstA enzyme mutant is as shown in SEQ ID NO: 2. At least one position selected from the 148th position, the 298th position, the 300th position, the 301st position, the 303th position, the 304th position, the 312th position, the 314th position and the 315th position has a mutated amino acid sequence. Under preferable conditions, the yield of cypermethrin after 48 hours of reaction in the condensation reaction method provided by the invention reaches 96.62%, which is obviously superior to that of the currently reported condensation reaction method.