Synthesis, stereochemistry, and antimicrobial evaluation of substituted piperidin-4-one oxime ethers
作者:C. Ramalingan、Y.T. Park、S. Kabilan
DOI:10.1016/j.ejmech.2006.02.005
日期:2006.6
In a wide search program toward new and efficient antimicrobial agents, a series of substituted piperidin-4-one oxime ethers (5a-5k) was synthesized and tested for their in vitro antibacterial and antifungal activities. Also, the structures of these oxime ethers and their relative stereochemistries have been investigated by nuclear magnetic resonance spectroscopy. In all the oxime ethers synthesized
在针对新型高效抗菌剂的广泛搜索计划中,合成了一系列取代的哌啶-4-酮肟醚(5a-5k),并对其体外抗菌和抗真菌活性进行了测试。而且,已经通过核磁共振波谱研究了这些肟醚的结构及其相对的立体化学。在所有合成的肟醚中,根据(1)H NMR和(13)C NMR谱推导肟醚部分同构到C-5(E-异构体)的NO键的取向。发现在空间上受阻较小的化合物C-3(H)和C-5(H)-或C-3(Me)和C-5(H)取代的化合物5a,5c,5d,5f, 5g,5i和5j更喜欢椅子构象,而在空间上更受阻碍的C-3(Me)和C-5(Me)取代的那些5b,5e,5h和5k更喜欢扭曲船构象。在测试的肟醚中,1,3,5-三甲基-2,6-二苯基哌啶-4-酮基O-(2-氯苯基甲基)肟(5h)对枯草芽孢杆菌具有良好的抗菌性能,最小抑菌浓度(MIC)接近与参考药物链霉素相比。1,3-二甲基-2,6-二苯基哌啶-4-酮O-(2-氯苯基甲基)肟(5g)和1