TFA-catalyzed Q-Tube Reactor-Assisted Strategy for the Synthesis of Pyrido[1,2-b][1,2,4]triazine and Pyrido[1′,2′:2,3][1,2,4]triazino[5,6-b]indole Derivatives

An efficient high-pressure-assisted trifluoroacetic acid-catalyzed protocol for synthesizing unreported novel pyrido-[1,2-b][1,2,4]triazine and pyrido[1',2':2,3] [1,2,4] triazino [5,6-b]-indole derivatives has been established. This strategy includes the condensation reactions of various 1-amino-2-imino-4-arylpyridine-3-carbonitrile derivatives with indoline-2,3-dione (isatin) derivatives and alpha-keto acids such as pyruvic acid and phenylglyoxylic acid. This strategy includes utilizing the Q-tube reactor as an efficient and safe tool to conduct these reactions under high-pressure conditions. In addition, trifluoroacetic acid was used to induce this transformation. In this research, conducting the targeted reactions under high pressure using the Q-tube reactor was found to be superb in comparison to that under the traditional refluxing conditions. X-ray single-crystal analysis was utilized in this study to authenticate the structure of the synthesized products.

Automated summary

An efficient high-pressure-assisted trifluoroacetic acid-catalyzed protocol has been established for synthesizing unreported novel pyrido-triazine and pyrido-triazino-indole derivatives. The use of Q-tube reactor and trifluoroacetic acid was crucial for the success of the transformation, as X-ray single-crystal analysis was utilized to authenticate the structure of the synthesized products.