Use of the vinyl group as an efficient protecting group for azole N- atoms: Synthesis of polyfunctionalized imidazoles and thieno[2,3-d] ⇌ [3,2-d]imidazole
作者:David J. Hartley、Brian Iddon
DOI:10.1016/s0040-4039(97)00957-x
日期:1997.6
2 → 5 → 4 via Br → MgBr and other exchange reactions. Efficient removal of the vinyl groups from the resulting polyfunctionalized imidazoles was achieved with ozone or potassium permanganate. An extension of this methodology has allowed the first synthesis of thieno[2,3-d] ⇌ [3,2-d]-imidazole.
由2,4,5-三溴咪唑和1,2-二溴乙烷制得2,4,5-三溴-1-乙烯基咪唑,并通过Br→MgBr等交换反应以2→5→4的顺序选择性取代其Br原子反应。用臭氧或高锰酸钾可有效地从所得的多官能化咪唑中除去乙烯基。此方法的扩展允许首次合成噻吩并[2,3- d ]⇌[3,2- d ]-咪唑。