Hypervalent Iodine in Synthesis 81: A One-Pot Procedure for the Synthesis of 1H-Imidazole Derivatives by Cyclocondensation of Ketones with [Hydroxy(tosyloxy)iodo]benzene and Amidines
作者:Peng-Fei Zhang、Zhen-Chu Chen
DOI:10.1055/s-2001-18059
日期:——
by cyclocondensation of ketones with [hydroxy(tosyloxy)iodo]benzene and selenoamides.6 Herein, we would like to report a one-pot procedure for the synthesis of imidazoles, which includes α-tosyloxylation of ketones with [hydroxy(tosyloxy)iodo]benzene in acetonitrile, followed by treatment with amidines in chloroform. The overall yields of imidazoles are 42–67% without isolation of any intermediates
咪唑核存在于多种天然产物中,如维生素B12及其衍生物、1组氨酸衍生物、2咪唑核苷和核苷酸3。因此,咪唑核的合成变得越来越重要,文献报道了几种咪唑衍生物的合成。 4 作为我们针对在有机合成中使用高价碘试剂的计划的一部分,5 我们最近报道了通过酮与 [羟基(甲苯磺酰氧基)碘] 苯和硒酰胺的环缩合来方便合成硒唑。6 在此,我们希望报告合成咪唑的一锅法,包括在乙腈中用[羟基(甲苯磺酰氧基)碘]苯对酮进行α-甲苯磺酰氧基化,然后在氯仿中用脒处理。咪唑的总产率为 42-67%,无需分离任何中间体(方案 1)。