302918-03-2Relevant articles and documents
A novel approach to bis(1,3-azol-2-yl)acetonitriles and bis(1,3-azol-2-yl)methanes: Via the [3 + 2]-dipolar cycloaddition of imidazole N -oxides and 2-heteroaryl-3,3-dimethylacrylonitriles
Kutasevich, Anton V.,Niktarov, Anton S.,Uvarova, Ekaterina S.,Karnoukhova, Valentina A.,Mityanov, Vitaly S.
, p. 8988 - 8998 (2021/11/09)
A new synthetic approach for obtaining previously unknown bis(1,3-azol-2-yl)acetonitriles and bis(1,3-azol-2-yl)methanes has been developed. It is based on 1,3-dipolar cycloaddition between 2-unsubstituted imidazole N-oxides and 2-(1,3-azol-2-yl)-3,3-dimethylacrylonitriles, which are easily available through the condensation of (1,3-azol-2-yl)acetonitriles with acetone. The method allows for the construction of various unsymmetric derivatives based on imidazole, oxazole, thiazole, and 1,3,4-thiadiazole cyclic molecules. Its potential has been demonstrated via the synthesis of 24 diverse derivatives with yields of 29-92%. Bis(1,3-azol-2-yl)acetonitriles can be converted to the corresponding bis(1,3-azol-2-yl)methanes via simple acid hydrolysis followed by subsequent spontaneous decarboxylation at nearly quantitative yields.
Synthesis of novel 3-(1,3-thiazol-2-yl)-7,8-dihydroquinoline-2,5(1H,6H)- diones
Dzhavakhishvili,Gorobets,Chernenko,Musatov,Desenko
experimental part, p. 422 - 427 (2009/06/05)
An efficient method for the synthesis of novel 3-(1,3-thiazol-2-yl)-7,8- dihydroquinoline-2,5(1H,6H)-diones from various 2- dimethylaminomethylidenecyclohexane-1,3-diones, (1,3-thiazol-2-yl)acetonitriles, and dimethylformamide dimethyl acetal was developed. These transformations proceeded through intermediate 2-[2-(4-aryl-1,3-thiazol-2-yl)-2-cyanoethenyl]-3- oxocyclohex-1-en-1-olates. They were isolated as piperidinium salts and used in further heterocyclization reactions with aromatic amines, giving novel 1-aryl-3-(1,3-thiazol-2-yl)-7,8-dihydroquinoline-2,5(1H,6H)-diones. These compounds were also obtained by preparative three-step "one pot" synthesis under controlled microwave irradiation.
A new and convenient synthesis of 1,2-diamino-3-hetarylpyrrole derivatives
Volovenko, Yulian M.,Tverdokhlebov, Anton V.,Gorulya, Alexandr P.,Shishkina, Svetlana V.,Zubatyuk, Roman I.,Shishkin, Oleg V.
, p. 663 - 668 (2007/10/03)
A number of 1-acylamino-2-amino-3-hetaryl-4-oxo-2-pyrrolines 13-50 were prepared by treatment of 4-chloro-2-hetaryl-3-oxobutanenitriles 11a-h with substituted benzoic and 2-furanoic acid hydrazides in DMF at 110-120°C. When the same reagents were coupled in the presence of triethylamine, a definite dependence of the course of the reaction on the nature of the chloronitriles 11a-h was observed. The steric arrangement of the heterocyclic nitrogen atom in chloronitriles 11 seemed to have a critical influence on the nature of the products obtained. Thus, compounds 11d-h with sterically hindered nitrogen atoms gave the pyrrolines 25-50 mentioned above, while unhindered derivatives 11a-c afforded products of intramolecular alkylation, namely the 3-cyano-2-oxo-1,2-dihydropyrrolo[1,2-a]benzazoles 51-53. An X-ray diffraction study of 2-amino-3-(2-benzothiazolyl)-1-(p-nitrobenzoylamino)-4-oxo-2-pyrroline (24) was carried out to confirm the structures of compounds 13-50 unambiguously. An attempt to extend this reaction to p-tolylsulfonylhydrazine resulted in the simple alkylation products 12a, 12c, and 12e, without subsequent ring closure.