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Updated: Sep 23, 2025

Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
Published on: January 3, 2018
Towards Asymmetrical Methylene Blue Analogues: Synthesis and Reactivity of 3-N'-Arylaminophenothiazines
Alena Khadieva1, Mansur Rayanov1, Ksenia Shibaeva1
1A.M. Butlerov' Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia.
Abstract:
The search for new ways to obtain analogues of the well-known Methylene Blue dye is an important synthetic task. Herein, we proposed and developed an approach to the synthesis of 3-N'-arylaminophenothiazines and asymmetrical 3,7-di(N'-arylamino)phenothiazines. This approach included the optimization of synthetic strategy by quantification analysis of the positive charge distribution in the cation of 3-N'-arylaminophenothiazine derivative. The obtained experimental data are confirmed by DFT studies. Two synthetic routes for asymmetrical phenothiazine diarylamino derivatives were suggested and verified. The developed convenient and versatile synthetic approach makes it easy to obtain aromatic Methylene Blue isostructural analogues with various substituents. As a result, a series of novel 3-N'-arylaminophenothiazines and asymmetrical 3,7-di(N'-arylamino)phenothiazines containing ester, tert-butoxycarbonyl, sulfonic acid, hydroxyl and amine groups were obtained in high yields.
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