A formal [4 + 2] annulation of diamines and prop-2-ynyl sulfonium salts was developed. This strategy enables efficient access to tetrahydroquinoxalines in excellent yields.
![Graphical abstract: A formal [4 + 2] annulation of diamines and prop-2-ynyl sulfonium salts for the synthesis of tetrahydroquinoxalines](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=D2OB01590K&imageInfo.ImageIdentifier.Year=2022)
F. Xia, Y. Lu, P. Sun, Q. Guo, Q. Shi, J. Zhang and C. Qiu, Org. Biomol. Chem., 2022, 20, 8415 DOI: 10.1039/D2OB01590K
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