Browsing by Author "Manavendra Kumar Singh"

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In vitro antimicrobial activity of o-phenylenediamine-tert-butyl-N-1,2,3-triazole carbamate analogs
(Birkhauser Boston, 2014) Manavendra Kumar Singh; Mayank Gangwar; Dharmendra Kumar; Ragini Tilak; Gopal Nath; Alka Agarwal
In an attempt to design and synthesize effective antimicrobial agents using click chemistry, mono- and di-alkyne-substituted monoboc protected o-phenylenediamines were reacted with different substituted aryl azides which yielded 18 new compounds (4a-4k and 5a-5f, 5l). Structures of all newly synthesized compounds were established by 1H and 13C NMR analysis. The intermediate compound 1 was also confirmed by X-ray crystallography. The title compounds were screened for their antibacterial activity against Gram +ve bacteria (Staphylococcus aureus and Enterococcus faecalis), Gram -ve bacteria (Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa), and their antifungal profile were tested on (Candida tropicalis , Candida albicans, Candida krusei, and Cryptococcus neoformans) as well as on molds such as (Aspergillus niger, Aspergillus fumigatus). The compounds 4k and 5f both showed maximum potency against S. aureus (ATCC 25323) strain with MIC value of 6.25 μg/ml, which is comparable with standard drug ciprofloxacin (MIC 6.25 μg/ml) while remaining compounds showed moderate to weak activity. Further, all compounds showed average antifungal activity in the range of 100-200 μg/ml. © Springer Science+Business Media New York 2014.
N-(Prop-2-yn-1-yl)-1,3-benzothiazol-2-amine
(2011) Alka Agarwal; Manavendra Kumar Singh; Suryabhan Singh; S. Bhattacharya; Satish K. Awasthi
In the title compound, C 10H 8N 2S, the 2-amino-benzothia-zole and propyne groups are not coplanar [dihedral angle = 71.51 (1)°]. The crystal structure is stabilized by strong inter-molecular N-H⋯N hydrogen bonds and C-H⋯C, C-H⋯π and F-type aromatic-aromatic [centroid-centroid distance = 3.7826 (12) Å] interactions are also observed.