作者:B. V. Lyalin、V. A. Petrosyan
DOI:10.1007/s11172-013-0140-z
日期:2013.4
A synthesis of 4-iodo-substituted pyrazoles by iodination of pyrazole and its derivatives in the heterophase (H2O/CHCl3 (CCl4)) medium with the system KI-KIO3 in the presence of H2SO4 additives was accomplished. The yields of 4-iodo-substituted pyrazoles in the iodination of pyrazole, 3,5-dimethylpyrazole, pyrazole-3(5)-carboxylic acid, 1-methylpyrazole-3-carboxylic acid, 1-methylpyrazole-5-carboxylic acid, 3-nitropyrazole, 1-methyl-3-nitropyrazole, 1-methylpyrazole, 1-ethylpyrazole, and 1-isopropylpyrazole were within 80–97%, whereas in the case of 3-nitropyrazole-5-carboxylic acid it was 32%.
通过在异相(H2O/CHCl3 (CCl4))介质中,使用KI-KIO3体系和H2SO4添加剂对吡唑及其衍生物进行碘化,成功合成了4-碘取代的吡唑。吡唑、3,5-二甲基吡唑、吡唑-3(5)-羧酸、1-甲基吡唑-3-羧酸、1-甲基吡唑-5-羧酸、3-硝基吡唑、1-甲基-3-硝基吡唑、1-甲基吡唑、1-乙基吡唑和1-异丙基吡唑的4-碘取代吡唑的产率在80%至97%之间,而3-硝基吡唑-5-羧酸的产率为32%。