An operationally simple and convenient synthesis method toward a series of diverse spiro[4.4]thiadiazole derivatives via double [3 + 2] 1,3-dipolarcycloaddition of nitrilimines generated in situ from hydrazonyl chlorides with carbon disulfide has been achieved undermild reaction conditions.
In this paper, a [3 + 2] cycloaddition of Baylis–Hillmanadducts and nitrilimines has been achieved under mild reaction conditions, providing a concise approach to access biologically important pyrazoline derivatives.
Certain benzoyl chloride phenylhydrazones have been found to be active against insects and mites, and they have also been found to be effective, broad-spectrum anthelmintics for suppressing parasitic worms in animals, particularly sheep. The benzoyl ring and the phenylhydrazone ring can be substituted with a halogen atom, a nitro group, or an alkyl group of from 1 to 6 carbon atoms, inclusive. A new class of pentahalobenzoyl chloride phenylhydrazones is described, particularly pentafluorobenzoyl chloride phenylhydrazones. The compounds are prepared by reacting a benzoic acid phenylhydrazide with phosphorus pentachloride to obtain a benzoyl chloride (dichlorophosphinyl)phenylhydrazone that is reacted with phenol to produce the desired benzoyl chloride phenylhydrazones. Certain of the compounds can be prepared by direct chlorination of a benzaldehyde phenylhydrazone. Methods of using the new compounds and new anthelmintic formulations are described. The new compound p-toluoyl chloride phenylhydrazone is effective against worms at rates at least as low as 100 mg./kg. of body weight in sheep.
Spirotriazoline oxindoles: A novel chemical scaffold with in vitro anticancer properties
作者:Carlos J.A. Ribeiro、Rute C. Nunes、Joana D. Amaral、Lídia M. Gonçalves、Cecília M.P. Rodrigues、Rui Moreira、Maria M.M. Santos
DOI:10.1016/j.ejmech.2017.09.037
日期:2017.11
design and synthesis of a library of twenty-six spirotriazoline oxindoles and their in vitro evaluation as potential anticancer agents is reported. The antiproliferative activity of the synthesized compounds was assessed against four different cancer cell lines (HCT-116 p53 (+/+), HCT-116 p53 (−/−), MCF-7, and MDA-MB-231). Four spirotriazoline oxindoles showed selectivity against the four cancer cell
[3 + 2]-Cycloaddition of <i>in Situ</i> Generated Nitrile Imines and Acetylene for Assembling of 1,3-Disubstituted Pyrazoles with Quantitative Deuterium Labeling
作者:Vladimir V. Voronin、Maria S. Ledovskaya、Evgeniy G. Gordeev、Konstantin S. Rodygin、Valentine P. Ananikov
DOI:10.1021/acs.joc.8b00155
日期:2018.4.6
methodology for the preparation of 1,3-disubstituted pyrazoles from in situ generated nitrile imines and acetylene is reported. The reactions are performed in a simple two-chamber reactor. One part of the reactor is loaded with hydrazonoyl chloride precursors of active nitrile imine species and a base. The other part is used to generate acetylenefrom CaC2 and water. Partitioning of the reactants improves