One-Pot Synthesis of Substituted Piperidinones and 3,4-Dihydropyrimidinones Using a Highly Active and Recyclable Supported Ionic Liquid Phase Organocatalyst
摘要:
合成了 1-乙基-3-甲基咪唑鎓硫酸乙酯,并制备了其支撑离子液体相,将其用作合成取代哌啶酮和 3,4-二氢嘧啶酮的有机催化剂。该离子液体通过 1H NMR、13C NMR 和质谱进行了表征。该催化剂新颖、稳定、完全异构,可多次循环使用,并可通过过滤轻松回收。利用扫描电子显微镜、透射电子显微镜、热重分析和能量色散 X 射线光谱技术对其进行了表征。制备过程非常简单,无需进一步的色谱纯化,即可获得产率良好至极佳、纯度合理的产品。
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.
13C NMR chemical shifts, in someN-chloro-2,6-diarylpiperidin-4-ones
作者:Misbah Ul Hasan、M. Arab
DOI:10.1002/mrc.1260251113
日期:1987.11
The 13C shifts in several N-chloro-2,6-diarylpiperidin-4-ones have been measured and compared with previously reported sifts in the corresponding 2,6-diarylpiperidones. The shifts of the α-carbons in these compounds move downfield by 12–13 ppm, which can be attributed to the increased electronegativity of the nitrogen atoms. The changes in the chemical shifts of the β-carbons are minimal. Surprisingly, the absorptions of the carbonyl carbons move upfield by as much as 4.0 ppm. The magnitude of the shift in the resonance of the carbonyl carbon indicates the possibility of a transannular interaction between the nitrogen and the carbonyl group, which has not previously been observed in these systems. A preferred conformation for the aryl group in these compounds is also proposed.
Synthesis, NMR spectral studies and antimicrobial evaluation of some 2-(benzothiazol-2-yl)-1-(alkyl-2r,6c-diarylpiperidin-4-ylidine)hydrazine derivatives
作者:J. John Francis Xavier、R. Venkateswaramoorthi、A. Kamaraj、K. Krishnasamy
DOI:10.1007/s00044-013-0533-4
日期:2013.11
Substituted 2-(benzothiazol-2-yl)-1-(alkyl-2,6-diarylpiperidin-4-ylidine)hydrazines 10–17 were synthesized by the condensation of different 2r,6c-diarylpiperidin-4-ones 1–8 with 2-hydrazinobenzothiazole 9. All the synthesized compounds were investigated in solution and in the solid state by IR, 1H, 13C and 2D NMR spectral techniques. The structure–activity relationships were studied by the screening