Synthesis, characterization, computational calculation and biological studies of some 2,6-diaryl-1-(prop-2-yn-1-yl)piperidin-4-one oxime derivatives
摘要:
A new series of 2,6-diaryl-1-(prop-2-yn-1-yl)piperidin-4-one oximes (17-24) were designed and synthesized from 2,6-diarylpiperidin-4-one oximes (9-16) with propargyl bromide. Unambiguous structural elucidation has been carried out by investigating IR, NMR (H-1, C-13, H-1-H-1 COSY and HSQC), mass spectral techniques and theoretical (DFT) calculations. Further, crystal structure of compound 17 was evaluated by single crystal X-ray diffraction analysis. Single crystal X-ray structural analysis of compound 17 evidenced that the configuration about C=N double bond is syn to C-5 carbon (E-form). The existence of chair conformation was further confirmed by theoretical DFT calculation. All the synthesized compounds were screened for in vitro antimicrobial activity against a panel of selected bacterial and fungal strains using Ciprofloxacin and Ketoconazole as standards. The minimum inhibition concentration (MIC) results revealed that most of the 2,6-diaryl-1-(prop-2-yn-1-yl)piperidin-4-one oximes (17, 19, 20 and 23) exhibited better activity against the selected bacterial and fungal strains. (C) 2014 Elsevier B.V. All rights reserved.
Abstract A new class of various furoyl derivatives of 2,6-disubstituted piperidin-4-ones were synthesized and characterized by FTIR, NMR, mass and single crystal X-ray diffraction methods. The synthesized compounds were subjected to in-vitro antibacterial and antifungal activities against pathogenic microbial strains. The results pointed out that compounds 11, 12 & 14 displayed pronounced activity
benzotriazole nucleus into piperidinering is achieved through hydrazone formation. The characterization of the synthesized compounds was carried out using FT-IR, 1H &13C NMR, 1H–1H COSY, 1H–13C COSY, NOESY spectral techniques and GC-Mass spectrum. The spectral assignments were done without ambiguity using 2D-NMR techniques. The conformational preference of the piperidinering deduced from the spectral
Abstract A series of novel cyanoacetyl hydrazones of 3-alkyl-2,6-diarylpiperidin-4-ones were synthesized stereoselectively and characterized by IR, Mass, 1 H NMR, 13 C NMR, 1 H– 1 H COSY and 1 H– 13 C COSY spectra. The stereochemistry of the synthesized compounds was established using NMR spectra. Antimicrobial screening of the synthesized compounds revealed their antibacterial and antifungal potencies
摘要 立体选择性地合成了一系列 3-烷基-2,6-二芳基哌啶-4-酮的新型氰基乙酰腙,并通过红外、质谱、 1 H NMR、 13 C NMR、 1 H– 1 H COZY 和 1 H– 13 表征。 C 舒适光谱。合成化合物的立体化学是通过核磁共振谱确定的。合成化合物的抗菌筛选揭示了它们的抗菌和抗真菌效力。发现化合物 15 对产气肠杆菌的生长抑制优于标准药物。
Chemoselective synthesis and spectral studies of <i>N</i>-thiocyanatoacetyl derivatives of 3-alkyl-2,6-diarylpiperidin-4-ones
of the respective piperidin–4–ones and the ambident thiocyanate nucleophile. The synthesized compounds have been characterized through FT–IR, 1H, 13C, 1H–1H COSY, 1H–13C COSY and NOESY spectra. The spectral data reveal the conformational priority of the six-membered heterocyclic ring.
A stereospecific synthesis of some thiazolidinones and thiazoles was achieved conveniently through certain α-halo keto agents and reactivity of chloroacetyl chloride was successfully enhanced by CsF–Celite + CH3COONa. NMR studies revealed that the configuration of N–N bond is found to be anti with respect to C-3 alkyl group while CN bond in thiazolidinone is trans with respect to N–N bond. Antimycobacterial