81112-08-5Relevant articles and documents
Synthesis method of pimobendan
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Paragraph 0015; 0070; 0071, (2020/08/29)
The invention provides a synthesis method of pimobendan, and belongs to the technical field of pharmaceutical chemicals. The synthesis method comprises the following steps: (1) in an organic solvent,taking acetanilide and 2-chloropropionyl chloride as raw materials, generating a compound I under the action of a Lewis acid catalyst; (2) in acid anhydride, the compound I and nitric acid are subjected to a nitration reaction to produce a compound II; (3) carrying out nucleophilic substitution reaction on the compound II and diethyl malonate in a reaction reagent under the action of sodium methoxide, carrying out hydrolysis reaction in the reaction reagent under the action of sodium hydroxide, and regulating the pH value of the reaction system to 3-4 by using diluted hydrochloric acid to generate a compound III; (4) reacting the compound III with a decarboxylation reagent to generate a compound IV; (5) reacting the compound IV with hydrazine hydrate in a reaction solvent in the presence of a noble metal catalyst to generate a compound V; and (6) reacting the compound V with p-methoxybenzaldehyde in a reaction solvent under the action of a catalyst to generate pimobendan VI. The pimobendan prepared by the method is simple in preparation method and low in reagent toxicity and has excellent clinical curative effect and clinical safety.
DIHYDROPYRIDAZINONES SUBSTITUTED WITH PHENYLUREAS
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Page/Page column 200, (2018/05/27)
Compounds of formula (I) which are nicotinamide phosphoribosyltransferase (NAMPT) inhibitors and their use for the treatment of hyperproloferative diseases and/or disorders responsive to induction of cell death.
Enantioselective and Diastereoselective Construction of Chiral Amino Alcohols by Iridium-f-Amphox-Catalyzed Asymmetric Hydrogenation via Dynamic Kinetic Resolution
Wu, Weilong,You, Cai,Yin, Congcong,Liu, Yuanhua,Dong, Xiu-Qin,Zhang, Xumu
supporting information, p. 2548 - 2551 (2017/05/24)
The iridium-f-amphox-catalyzed asymmetric hydrogenation of racemic α-amino β-unfunctionalized ketones proceeds via a DKR (dynamic kinetic resolution) process for the construction of various chiral N,N-disubstituted α-amino β-unfunctionalized alcohols in quantitative yields with excellent enantioselectivities and diastereoselectivities (all products >99% ee and >99:1 dr, TON up to 100 000). Importantly, this catalytic asymmetric hydrogenation with a DKR process provided a highly efficient and powerful synthetic strategy for the preparation of key chiral intermediates of the preclinical antitumor agent (S,S)-R116010.
Arylalkane, arylalkene and aryl azaalkane, medicaments containing said compounds and method for the production thereof
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Page/Page column 85-86, (2010/11/27)
The present invention relates to compounds of general formula [in-line-formulae]R—Z1—Z2—Z3—R1, ??(I)[/in-line-formulae] wherein R, R1 and Z1 to Z3 are defined as in claim 1, the tautomers, the diastereomers, the enantiomers, the mixtures thereof and the salts thereof, particularly the physiologically acceptable salts thereof with inorganic or organic acids or bases, which have valuable pharmacological properties, particularly CGRP-antagonistic properties, pharmaceutical compositions containing these compounds, their use and processes for preparing them.
1-(4-aminophenyl)-2-piperidinopropanone derivatives, preparation process and use in therapeutics
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, (2008/06/13)
The present invention relates to 1-(4-aminophenyl)-2-piperidinopropanone derivatives which are selected from (a) the compounds corresponding to the general formula STR1 where R is H or CH3 CO, A is H or Cl, B is H or Cl and Z is C1 -
1-(acetylaminophenyl)-2-aminopropanone derivatives and pharmaceutical compositions thereof
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, (2008/06/13)
The present invention relates, by way of new industrial products, to 1-(acetylaminophenyl)-2-amino-propanone derivatives selected from the group consisting of (a) the compounds of the formula in which NR1 R2 represents a piperidino g
1-(acetylaminophenyl)-2-aminopropanone derivatives and antidepressant compositions thereof
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, (2008/06/13)
The present invention relates, by way of new industrial products, to 1-(acetylaminophenyl)-2-amino-propanone derivatives selected from the group consisting of (a) the compounds of the formula in which R1 represents a C1 -C4/sub
6-(substituted phenyl)-5-methyl-4,5-dihydropyridazin-3(2H)-ones of medicinal interest. The synthesis of SK&F 94836 and SK&F 95654
Burpitt,Crawford,Davies,Mistry,Mitchell,Pancholi,Coates
, p. 1689 - 1695 (2007/10/02)
Two synthetic routes to the dihydropyridazinone-cyanoguanidine 4 (SK&F 94836) are described, both proceeding via the anilino compound 6. An efficient synthesis of the dihydropyridazinone-pyridone 5 (SK&F 95654) is reported. This synthesis proceeds via the fluoro-keto-acid 24, with subsequent displacement of the fluoro substituent by 4-pyridone. The surprising effectiveness of water as a solvent in this reaction has been highlighted.
Chemical process
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, (2008/06/13)
This invention relates to a Friedel-Crafts acylation process using trichlorobenzene as solvent.