129560-03-8Relevant articles and documents
Preparation method of substituted phenoxy benzylamine compound and preparation method of pyrazole carboxamide compound
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, (2021/06/26)
The invention discloses a preparation method of a substituted phenoxy benzylamine compound. P-halobenzonitrile is taken as an initial raw material, R'OH is taken as a solvent in the presence of R'OM, the substituted phenoxy benzylamine compound is obtained through hydrogen reduction, and the preparation method has the advantages of high yield and high purity. The invention also discloses a preparation method of pyrazole carboxamide. The preparation method of pyrazole carboxamide comprises the following steps: salifying the substituted phenoxy benzylamine compound, and reacting with a substituted pyrazole acyl chloride compound to prepare the pyrazole carboxamide compound at an expected high yield. The preparation methods provided by the invention have the advantages of high product purity, high yield, low solvent loss and low production cost.
Structure-Activity Relationship Studies of Tolfenpyrad Reveal Subnanomolar Inhibitors of Haemonchus contortus Development
Le, Thuy G.,Kundu, Abhijit,Ghoshal, Atanu,Nguyen, Nghi H.,Preston, Sarah,Jiao, Yaqing,Ruan, Banfeng,Xue, Lian,Huang, Fei,Keiser, Jennifer,Hofmann, Andreas,Chang, Bill C. H.,Garcia-Bustos, Jose,Wells, Timothy N. C.,Palmer, Michael J.,Jabbar, Abdul,Gasser, Robin B.,Baell, Jonathan B.
, p. 1036 - 1053 (2019/01/14)
Recently, we have discovered that the registered pesticide, tolfenpyrad, unexpectedly and potently inhibits the development of the L4 larval stage of the parasitic nematode Haemonchus contortus with an IC50 value of 0.03 μM while displaying good selectivity, with an IC50 of 37.9 μM for cytotoxicity. As a promising molecular template for medicinal chemistry optimization, we undertook anthelmintic structure-activity relationships for this chemical. Modifications of the left-hand side (LHS), right-hand side (RHS), and middle section of the scaffold were explored to produce a set of 57 analogues. Analogues 25, 29, and 33 were shown to be the most potent compounds of the series, with IC50 values at a subnanomolar level of potency against the chemotherapeutically relevant fourth larval (L4) stage of H. contortus. Selected compounds from the series also showed promising activity against a panel of other different parasitic nematodes, such as hookworms and whipworms.