Silver-Catalyzed Isocyanide-Isocyanide [3+2] Cross-Cycloaddition Involving 1,2-Group Migration: Efficient Synthesis of Trisubstituted lmidazoles
作者:Hongwei Wang、Rapolu Kiran Kumar、Yang Yu、Lin Zhang、Zhaohong Liu、Peiqiu Liao、Xihe Bi
DOI:10.1002/asia.201601024
日期:2016.10.20
molecules. The isocyanide–isocyanide [3+2] cross‐cycloaddition reaction constitutes a straightforward method to access imidazoles starting from the easily available chemicals. So far, only three successive reports are known and all lead to the formation of 1,4‐disubstituted imidazoles. Here, we report the first isocyanide–isocyanide [3+2] cross‐cycloaddition reaction allowing for the formation of 1,4,5‐trisubstituted
咪唑环是重要的五元芳族杂环,广泛存在于天然产物和合成分子中。异氰酸酯–异氰酸酯[3 + 2]的交叉环加成反应是从易获得的化学品开始获取咪唑的直接方法。到目前为止,只有三份连续的报告是已知的,所有这些都导致形成1,4-二取代的咪唑。在这里,我们报道了第一个异氰酸酯-异氰酸酯[3 + 2]交叉环加成反应,该反应允许在银催化下形成1,4,5-三取代的咪唑。在环化过程中,磺酰基,烷氧基羰基和氨基甲酰基发生了意外的1,2-迁移,这是三取代咪唑形成的原因。