Parveen M, Ali A, Ahmed S, Malla AM, Alam M, Pereira Silva PS, Silva MR, Lee DU. Synthesis, bioassay, crystal structure and ab initio studies of Erlenmeyer azlactones.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013;
104:538-545. [PMID:
23314102 DOI:
10.1016/j.saa.2012.11.054]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 11/10/2012] [Accepted: 11/18/2012] [Indexed: 06/01/2023]
Abstract
Several 4-arylidene-2-phenyl-5(4H)-azlactones have been synthesized via Erlenmeyer method. The synthesized compounds have been characterized on the basis of systematic spectral studies (IR, (1)H NMR, (13)C NMR, and MS). The compound (4Z)-4-(3,5-dimethoxybenzylidene)-2-phenyl-1,3-oxazol-5(4H)-one, C(18)H(15)NO(4), (5), crystallizes in the orthorhombic system, space group P2(1)2(1)2(1), with a=5.6793(3) Å, b=15.2038(7) Å, c=17.6919(10) Å, Mr=309.31, V=1527.64(14) Å(3), Z=4 and R=0.0547. The compound (4Z)-2-phenyl-4-(3,4,5-trimethoxybenzylidene)-1,3-oxazol-5(4H)-one, C(19)H(17)NO(5), (6) crystallizes in triclinic geometry with space group P-1, having unit cell parameters a=7.3814(3) Å, b=8.1446(3) Å, c=13.9845(5) Å, α=86.918(3), β=83.314(2), γ=82.462(3), Mr=339.34, V=827.16(5) Å(3), Z=2 and R=0.0433. The DFT calculations of compounds (5) and (6) have been carried out to ascertain the stability of Z-conformer. The in vitro antimicrobial activity of all the compounds (1-6) was evaluated by the disk diffusion method against gram +ve and gram -ve microorganism and fungal strains. The MIC of the synthesized compounds was determined by agar well diffusion method in 96-well microtiter plate. All the synthesized compounds were also screened for their free radical scavenging activity by DPPH method.
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