An efficient and one pot synthetic method of ipso-nitration of arylboronic acids has been developed. The high efficiency, general applicability, and broader substrate scope including heterocycles and functional groups make this method advantageous. Due to its simplicity, we expect to find application of this method in synthesis.
Vicarious nucleophilic substitution of hydrogen in nitroderivatives of five-membered heteroaromatic compounds
作者:Mieczyslaw Makosza、Ewa Kwast
DOI:10.1016/0040-4020(95)00445-e
日期:1995.7
Nitro derivatives of thiophene, furan and pyrrole react with carbanions containing leaving groups giving products of replacement of hydrogen with functionalized alkyl substituents. Many specific features of this reaction are discussed.
Photocatalytic and metal-free protocols to access various aromatic and heteroaromatic nitro compounds through ipso-nitration of readily available boronic acid derivatives were developed using non-metal-based, bench-stable, and recyclable nitrating reagents. These methods are operationally simple, mild, regioselective, and possess excellent functional group compatibility, delivering desired products
A novel methodology for the direct nitration of arylboronic acids has been developed. By using inexpensive tert-butyl nitrite various aromatic nitro compounds are produced in moderate to good yields (45–87%) without the need of any catalyst.
Protiodesilylation of substituted 2-trimethylsilylthiophens
作者:Giancarlo Seconi、Colin Eaborn
DOI:10.1039/p29810000931
日期:——
system; 3– and 5-O2NC4H2S˙SiMe3 are less reactive than would be expected from the correlations. Again with the exception of the data for the nitro-compound, the log krel values for the 4– and 5– substituted thiophens show very good correlation with σm+ and σp+ constants.