Synthesis, spectral characterization, and in vitro antibacterial and antifungal activities of novel 1,3-thiazine-2-amines comprising morpholine nucleus

Abstract

A collection of 4-(4-morpholinophenyl)-6-aryl-6H-1,3-thiazin-2-amines (20–28) were synthesized and their in vitro antimicrobial activity was investigated. Compound 21 against P. aeruginosa, 23 against B. subtilis, 24 against V. cholerae and P. aeruginosa, 26 against S. aureus and B. subtilis, 27 against B. subtilis and E. coli, and 28 against all tested bacterial strains exerted excellent antibacterial activity. Compound 20 against A. flavus and Rhizopus, 21, 26 against Rhizopus, 22, 27 against Mucor, 23 against A. flavus, 24 against both A. flavus and Mucor, 25 against all tested strains, and 28 against Rhizopus and M. gypseum exerted excellent antifungal activity.

Keywords::

• Morpholino thiazines
• thiourea
• synthesis
• antibacterial activity
• antifungal activity

Acknowledgements

The authors are thankful to the NMR Research Center, Indian Institute of Science, Bangalore for recording spectra. One of the authors (V.K.) is grateful to the Council of Scientific and Industrial Research (CSIR), New Delhi, Republic of India for providing financial support in the form of a CSIR-Senior Research Fellowship (SRF) in Organic Chemistry. Another author (J.T.) wishes to thank Annamalai University authorities for providing financial support in the form of a Research Fellowship.

Declaration of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.