由乙基1-(2-氧代-2-苯基乙基)-合成了一系列新颖的2-(5-(羟甲基)-3-苯基-1H-吡唑-1-基)-1-苯基乙醇衍生物(4)。 3-苯基-1 H-吡唑-5-羧酸酯衍生物(3),并通过IR,1 H NMR,HRMS和X射线晶体衍射进行表征。还通过13 C NMR确定4a,4d,4e和4f的结构。X射线晶体结构分析明确证实了异构体中间体3a和5a,并成功地与1进行了区分。结合到吡唑环上的亚甲基的1 H NMR化学位移。初步生物学评估表明,化合物4d和4e可通过细胞周期阻滞和自噬抑制A549肺癌细胞的生长。
A series of novel oxazolo[3,2-a]pyrazolo[1,5-d]pyrazin-5-ones were synthesized by the reaction of ethyl 3-aryl-1-(2-oxo-2-arylethyl)-1H-pyrazole-5-carboxylate derivatives and aminoethanol under microwave-assisted one-step and solvent-free conditions.
A series of substituted pyrazolo[1,5-a]pyrazin-4(5H)-one was synthesized by the reaction of ethyl 1-(2-oxo-2-phenylethyl)-3-phenyl-1H-pyrazole-5-carboxylate derivatives and 2-(2-aminoethoxy) ethanol or 2-morpholinoethanamine in the condition of microwave-assisted one-step and solvent-free in a good yield. The structures of the compounds were determined by IR, (1)H NMR and mass spectroscopy. In addition, a representative single-crystal structure was characterized by using X-ray diffraction analysis. Preliminary biological evaluation showed that the compounds could inhibit the growth of A549 and H322 cells in dosage-dependent manners. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of novel oxime-containing pyrazole derivatives and discovery of regulators for apoptosis and autophagy in A549 lung cancer cells
A series of novel oxime-containing pyrazole derivatives were synthesized by the reaction of ethyl 3-phenyl-1H-pyrazole-5-carboxylate derivatives and 2-bromo-1-phenylethanone followed by the reaction with hydroxylamine hydrochloride. The structures were determined by IR, (1)H NMR, HRMS, and X-ray analysis. A dose-and time-dependent inhibition of proliferation was observed in A549 lung cancer cell after compound treatment. Inhibition of growth was mainly attributed to the autophagy induction. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis, X-ray crystal structure and fluorescent spectra of novel pyrazolo[1,5-a]pyrazin-4(5H)-one derivatives
A series of fluorescent compounds, containing pyrazolo[1,5-a]pyrazin-4(5H)-one moiety, were designed and synthesized from ethyl 1-(2-oxo-2-phenylethyl)-3-phenyl-1H-pyrazole-5-carboxylates. The structures of the compounds have been confirmed by IR, (1)H NMR, HRMS and X-ray crystal diffraction. The optical properties of the compounds were investigated by UV-vis absorption and fluorescence spectroscopy. The effect of pH on the UV-vis absorption of compound 2a in methanol-H(2)O solutions was studied and interpreted by theory calculation. The pK(a), value of compound 2a was determined by the absorption spectra. (C) 2011 Elsevier B.V. All rights reserved.