CsF-Catalyzed Transannulation Reaction of Oxazolones: Diastereoselective Synthesis of Diversified <i>trans</i>-<i>N</i>-(6-Oxo-1,4,5,6-tetrahydropyrimidin-5-yl)benzamides with Arylidene Azlactones and Amidines
作者:Golnaz Parhizkar、Ahmad Reza Khosropour、Iraj Mohammadpoor-Baltork、Elahehnaz Parhizkar、Hadi Amiri Rudbari
DOI:10.1021/acscombsci.8b00027
日期:2018.6.11
straightforward synthetic strategy for the construction of new tetrasubstituted 1,3-diazinones is described. The procedure is based on CsF-catalyzed, microwave-assisted, ring transformation reaction of arylidene azlactones with amidines. Moreover, this technique provides diversified trans-N-(6-oxo-1,4,5,6-tetrahydropyrimidin-5-yl)benzamides with a good antimicrobial activity.
Benzoxazoles, benzothiazoles and benzimidazoles having substituents on the azole and benzene nuclei were synthesized evaluated for antifungal, insecticidal and herbicidal activities. It was found that benzimidazoles tended to exhibit antifungal activity while benzothiazoles tended to show herbicidal activity. Chloro, trifluoromethyl, methoxy and ethoxy groups at the 5 position were potent substituents, and the 2-pyridyl group at the 2 position is a common structural unit. Among several active derivatives, 7-chloro-2-(2-pyridyl) benzimidazole and 2-(2-pyridyl)-5-trifluoromethylbenzothiazole exhibited significant activity against Panonycus citri.
A series of N1-(substituted phenyl) pyridinecarboxamidines was synthesized by the condensation of substituted anilines with cyanopyridines in the presence of aluminum chloride or sodium amide and these compounds were evaluated for antiinflammatory activity by the carrageenin-induced rat paw edema assay. In the synthesis of N1-alkoxyphenyl pyridinecarboxamidines, it was found that o-alkoxyanilines reacted with aluminum chloride to afford o-aminophenol, while m- and p-alkoxyanilines were scarcely dealkylated. Sodium amide was successfully used for the condensation of o-alkoxyanilines with cyanopyridines. Among several active derivatives, N1-(2, 4-dichlorophenyl) pyridinecarboxamidine and N1-(4-chlorophenyl)-pyridinecarboxamidine exhibited significant antiinflammatory activities.