中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
5-碘-1-甲基-4-硝基咪唑 | 5-Iodo-1-methyl-4-nitroimidazole | 35681-63-1 | C4H4IN3O2 | 252.999 |
4-碘-1-甲基-5-硝基咪唑 | 4-Iodo-1-methyl-5-nitroimidazole | 76529-47-0 | C4H4IN3O2 | 252.999 |
4(5)- Bromo - and - iodo-imidazoles, activated by an adjacent nitro substituent, undergo nucleophilic displacement with methoxide, phenoxide , cyclic secondary chines and cyanide. The regiochemistry of the reactions of 5-iodo-4-nitroimidazole with methoxide has been confirmed by spectroscopic and X-ray methods, and a number of erroneous structures from the literature have been revised. Some apparently anomalous reactions of methoxide with 5-halo-1,2-dimethyl-4- nitroimidazoles, and of cyanide with 4-halo-1-methyl-5-nitroimidazole have been noted. The crystal and molecular structure of 5-methoxy-1-methyl-4-nitroimidazole has been determine: by direct methods. Crystals are monoclinic, P21/c, a 10.929(3), b 8 899(2), c 7.290(2) �; β 92.87(2)�; Z 4. The structure was refined to R = 0.095 for 818 reflections (I > 2σI).
In basic medium arylthiols displace bromo and iodo groups activated by nitro substituents in 5(4)-halo-4(5)- nitroimidazoles . The bromo compounds are slightly more reactive than the iodo analogues. Substituents at C5 are more readily displaced than those at C4. Methylsulfonyl groups, similarly activated by an adjacent nitro substituent, are displaced by a variety of nucleophiles. The imidazolethiol products are readily oxidized to the sulfones.