Isoprene-catalysed lithiation: deprotection and functionalisation of imidazole derivatives
作者:Rosario Torregrosa、Isidro M. Pastor、Miguel Yus
DOI:10.1016/j.tet.2006.11.032
日期:2007.1
isoprene-catalysed lithiation of different 1-substituted imidazoles (1) (such as trityl, allyl, benzyl, vinyl, N,N-dimethylsulfamoyl, para-toluenesulfonyl, tert-butoxycarbonyl, acetyl, trimethylsilyl, tert-butyldimethylsilyl derivatives) leads to the cleavage of the protecting group producing 1H-imidazole. The use of 1-(diethoxymethyl)imidazole (3) in the same lithiation reaction allows the preparation
不同的1-取代的咪唑(1)(例如三苯甲基,烯丙基,苄基,乙烯基,N,N-二甲基氨磺酰基,对甲苯磺酰基,叔丁氧基羰基,乙酰基,三甲基甲硅烷基,叔丁基二甲基甲硅烷基衍生物)的异戊二烯催化的锂化导致产生1 H-咪唑的保护基的裂解。在相同的锂化反应中使用1-(二乙氧基甲基)咪唑(3)可以制备相应的2-lithio中间体,该中间体通过与不同的亲电试剂反应生成2官能化的咪唑4。