Transformations of 5-(2-arylethynyl)-2-methyl-2H-tetrazoles under superelectrophilic activation

Add time:07/11/2019    Source:sciencedirect.com

Reaction of 5-arylethynyl-2-methyl-2H-tetrazoles (acetylene tetrazoles) with arenes under the action of Brønsted superacid CF3SO3H or acidic zeolite HUSY CBV-720 gives rise to E-/Z-5-(2,2-diarylethenyl)-2-methyl-2H-tetrazoles, as products of hydroarylation of acetylene bond, in yields up to 98% with predominant formation of E-isomers. Cationic intermediates of these reactions have been studied theoretically by DFT calculations. Addition of CF3SO3H to the triple bond of acetylene tetrazoles leads to the corresponding E-/Z-vinyl triflates in high yields. Hydration of triple bond in these tetrazoles in H2SO4 results in the formation of 5-(2-aryl-2-oxoethyl)-2-methyl-2H-tetrazoles. Tandem hydroarylation-ionic hydrogenation of acetylene tetrazoles in the systems acid(CF3SO3H or AlCl3)-arene-cyclohexane affords 5-(2,2-diarylethyl)-2-methyl-2H-tetrazoles.

We also recommend Trading Suppliers and Manufacturers of 2-(3-{(E)-[1-(2,4-dimethylphenyl)-4,6-dioxo-2-thioxotetrahydropyrimidin-5(2H)-ylidene]methyl}-2,5-dimethyl-1H-pyrrol-1-yl)-4,5,6,7-tetrahydro-1-benzothiophene-3-carbonitrile (cas 340302-37-6). Pls Click Website Link as below: cas 340302-37-6 suppliers

Prev:Synthesis, structure–activity relationships, and anticonvulsant activities of 2-amino-4H-pyrido[3,2-e][1,3]thiazin-4-one derivatives as orally active AMPA receptor antagonists
Next:Construction of 3-amino-2-oxindoles by direct amination of aniline or α-amino-acid derivatives to 3-bromooxindoles)