Synthesis, anti-HSV-1, and cytotoxic activities of some new pyrazole- and isoxazole-based heterocycles
摘要:
Ethyl 2,4-dioxo-4-(p-chloro)phenylbutyrate 2 obtained by condensation of 4-chloroacetophenone with diethyl oxalate was converted to 5-(4-chlorophenyl)-1-phenyl-1H-pyrazole-3-carbohydrazide 5 and 5-(4-chlorophenyl)isoxazole-3-carbohydrazide 6 in good yields. Treatment of 5 or 6 with phenylisothiocyanate and reaction of the resulting thiosemicarbazide 7 or 8 with chloroacetic acid and 4-fluorobenzaldehyde, phenacyl bromides gave the corresponding 4-thiazolidinone 9 or 10 or 1,3-thiazoles 11 or 12, respectively. While the intramolecular cyclization of 7 or 8 in concentrated sulfuric acid afforded 1,3,4-thiadiazoles 13 or 14. The reactivity of hydrazide 5 or 6 towards fluorinated aldehyde, hydrazonoyl chloride, and beta-ketoester was studied to give fluorinated hydrazones, bis-hydrazones, and pyrazoles 15-23. The newly synthesized compounds were screened for their antiviral activity, and compound 19 reduced the number of viral plaques of Herpes simplex type-1 (HSV-1) by 69%. The detailed synthesis and spectroscopic and biological data are reported.
Synthesis and Antimicrobial Activity of Some Novel Substituted 3-(Thiophen-2-yl)pyrazole-based Heterocycles
作者:Bakr F. Abdel-Wahab、Abdelbasset A. Farahat、Ghada E. A. Awad、Gamal A. El-Hiti
DOI:10.2174/1570180814666170327162447
日期:2017.10.3
Background: A series of novel substituted 3-(thiophen-2-yl)pyrazoles was synthesized efficiently and in high yields using simple and convenient procedures starting from 1-phenyl-3- (thiophen-2-yl)-1H-pyrazole-4-carbaldehyde. Methods: The structures of the newly synthesized products were established and their antimicrobialactivities were investigated against some bacteria and fungi. Results and Conclusion: