- Butenolide derivative as well as preparation method and application thereof
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The invention discloses a butenolide compound as well as a preparation method and an application thereof. The butenolide derivative has the inhibitory activity of protein tyrosine phosphatase 1B (PTP1B), improves insulin resistance of HepG2 cells, generates a remarkable hypoglycemic effect and can be used for preparing a medicine for treating diabetes mellitus.
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Paragraph 0045-0047; 0049
(2020/07/21)
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- Synthesis method 2- hydroxyl carboxylic ester (by machine translation)
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The method, is simple 2 - energy consumption, energy consumption is low, the production :(1) of waste water can be greatly reduced, the yield of the target product is high 2 - and the production cost ;(2) is greatly reduced (1). 2 - The method comprises the following steps, preparing 2 - hydroxycarboxylate, with an acid ;(3) by a byproduct ammonium salt (2) in step, and filtering the excess acid, to remove the byproduct ammonium salt, to obtain 2 - hydroxyl carboxylic acid ester product, by esterification reaction in step (, and filtering to remove 2 - the excess, alcohol), from, the reaction, solution obtained by the reaction solution; of the catalyst under the, action of, a catalyst, to obtain the product of the compound. (by machine translation)
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Paragraph 0052; 0054; 0055; 0058-0060
(2020/05/05)
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- One-pot, diversity-oriented synthesis of aryl-substituted benzoxacycles including benzofuran, coumarin, and benzoxazepine
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A one-pot method for the synthesis of benzoxacycles including benzofuran, coumarin, benzoxazepine, and benzoxazocine from a common synthetic intermediate was established. Benzoxacycles are privileged structures in medicinal chemistry and have featured in several clinically used drugs. The synthesis of a benzofuran containing an aryl substituent was accomplished using potassium carbonate and sodium hydride. The one-pot synthesis of coumarin was also carried out using trans-decalin as the solvent. The optimized conditions for the one-pot synthesis of benzoxazepine can also be applied to the synthesis of benzoxazocine.
- Masui, Hisashi,Ohkawa, Eri,Kitahara, Rika,Wanibuchi, Kiyofumi,Takahashi, Takashi
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p. 2273 - 2290
(2017/12/12)
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- 1,3-Bis(2,4,6-trimethylphenyl)imidazolium chloride in combination with triethylamine: An improved catalytic system for hydroacylation/reduction of activated ketones
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A rapid, economic, and high yielding methodology has been developed for hydroacylation/reduction of activated ketones by using 1,3-bis(2,4,6- trimethylphenyl)imidazolium chloride as a catalyst in combination with triethylamine. The reaction proceeded at an ambient temperature via generating N-heterocyclic carbene in situ that interacted with the (hetero)aryl aldehyde employed. While the reduction of ketones takes place in MeOH, the hydroacylation process was found to be effective in THF for both electron rich and deficient aldehydes.
- Sreenivasulu,Arun Kumar,Sateesh Reddy,Siva Kumar,Rajender Kumar,Chandrasekhar,Pal, Manojit
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supporting information; experimental part
p. 727 - 732
(2011/03/21)
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- MANDELIC ACID DERIVATIVES AND PREPARATION THEREOF
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The invention relates to compounds, compositions, methods of using and processes for producing optically active α-hydroxy derivatives using a combination of a chemical and biochemical methods. The process comprises reacting an ester compound with a racemic compound in the presence of an enzyme to obtain compounds (compositions and methods). The compounds produced may be useful for starting materials for physiologically active materials, functional materials and the like.
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Page/Page column 14
(2008/12/05)
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- DITHIAZOLE COMPOUNDS, MATRIX METALLOPROTEASE INHIBITORS AND EXTERNAL PREPARATIONS FOR THE SKIN
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A dithiazole compound or a salt thereof expressed by formula (I): wherein R1, is hydrogen atom, alkyl, etc.; R2 is hydrogen atom, hydroxy, alkyl, aryl, arylalkoxy, arylalkyl, etc.; R3 is one group of formulae (II), (III) and (IV): This compound has an excellent inhibiting action on matrix metalloprotease (MMPs) activity, and is useful for pharmaceutical, cosmetic and skin external compositions.
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