Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1086, Issue -, Pages 179-189Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2015.01.029
Keywords
Menadione; Vitamin K3; Naphthoquinone; pi-pi stacking; Hydrogen bonding; Michael addition
Categories
Funding
- RGYI scheme of Department of Biotechnology, New Delhi, India [BT/PR6565/GBD/27/456/2012]
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We would like to introduce eight analogues of n-alkylamino derivatives of vitamin K3 (2-methyl-1,4-naphthoquinone) viz, 2-(n-alkylamino)-3-methyl-1,4-naphthoquinone (where n-alkyl is methyl; LM-1, ethyl; LM-2, propyl; LM-3, butyl; LM-4, pentyl; LM-5, hexyl; LM-6, heptyl; LM-7, octyl; LM-8). All the above analogues have been successfully synthesized from vitamin K3 and characterized using different analytical techniques. Furthermore, in order to understand the mechanistic aspects of formation of LM-1 to LM-8 compounds, we could propose the mechanism. The FT-IR analysis of LM-1 to LM-8 indicate the presence of characteristic band of N-H group similar to 3287-3364 cm(-1), the variation was attributed to extensive intramolecular hydrogen bonding interaction. The molecular structure of LM-3 compound has been confirmed by single crystal X-ray diffraction analysis. LM-3 compound crystallises in triclinic space group P1. There were four independent molecules in asymmetric unit cell and their molecular interactions observed via N-H...O , C-H...O and pi-pi stacking of quinonoid rings. Pharmacological potential of all compounds has been evaluated in terms of their antibacterial activities against Pseudomonas aeruginosa and Staphylococcus aureus. All the compounds were active against both the strains while LM-2 was found to be more effective with a minimum inhibition concentration of 0.3125 mu g/mL and 0.156 mu g/mL respectively. (C) 2015 Elsevier B.V. All rights reserved.
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