2-Bromo-1-(1H-pyrazol-4-yl)ethanone: Versatile Precursor for Novel Mono- and Bis[pyrazolylthiazoles]
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- 作者：Mostafa E. Salem ; Ahmed F. Darweesh ; Ahmed E. M. Mekky ; Ahmad M. Farag and Ahmed H. M. Elwahy
- 刊名：Journal of Heterocyclic Chemistry
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：54
- 期：1
- 页码：226-234
- 全文大小：783K
- ISSN：1943-5193
文摘
The synthesis of novel bis(thiazoles) het2571-eo-0060" rel="references:#jhet2571-eo-0060 #jhet2571-eo-0061 #jhet2571-eo-0062"> and het2571-eo-0071" rel="references:#jhet2571-eo-0071 #jhet2571-eo-0072 #jhet2571-eo-0073"> is reported. Thus, reaction of Math/MathML" id="jhet2571-eo-0006">2-bromo-1-(5-methyl-1-phenyl-1H-pyrazol-4-yl)ethanone (het2571-eo-0006" rel="references:#jhet2571-eo-0006">) with the corresponding thioamide derivatives het2571-eo-0008" rel="references:#jhet2571-eo-0008">,het2571-eo-0009" rel="references:#jhet2571-eo-0009">, in refluxing EtOH in the presence of triethylamine, afforded 4-pyrazolylthiazoles het2571-eo-0011" rel="references:#jhet2571-eo-0011 #jhet2571-eo-0012"> in good yields. On the other hand, the novel bis(thiazoles) het2571-eo-0060" rel="references:#jhet2571-eo-0060 #jhet2571-eo-0061 #jhet2571-eo-0062"> and het2571-eo-0071" rel="references:#jhet2571-eo-0071 #jhet2571-eo-0072 #jhet2571-eo-0073"> were obtained from the reaction of het2571-eo-0006" rel="references:#jhet2571-eo-0006"> with the corresponding benzaldehyde thiosemicarbazones het2571-eo-0055" rel="references:#jhet2571-eo-0055 #jhet2571-eo-0056 #jhet2571-eo-0057">, het2571-eo-0068" rel="references:#jhet2571-eo-0068 #jhet2571-eo-0069 #jhet2571-eo-0070"> in refluxing EtOH. Compounds het2571-eo-0055" rel="references:#jhet2571-eo-0055 #jhet2571-eo-0056 #jhet2571-eo-0057"> and het2571-eo-0068" rel="references:#jhet2571-eo-0068 #jhet2571-eo-0069 #jhet2571-eo-0070"> were obtained by condensation of the corresponding bis(aldehydes) het2571-eo-0050" rel="references:#jhet2571-eo-0050 #jhet2571-eo-0051 #jhet2571-eo-0052"> and het2571-eo-0065" rel="references:#jhet2571-eo-0065 #jhet2571-eo-0066 #jhet2571-eo-0067"> with het2571-eo-0039">thiosemicarbazide.