A new synthetic strategy towards 2,4,5-trisubstituted 1H-imidazoles and highly substituted pyrrolo[1,2-c]imidazoles by use of α-azidochalcones via Michael addition-cyclization followed by Wittig reaction
作者:Mehdi Adib、Fariba Peytam、Mahmoud Rahmanian-Jazi、Hamid Reza Bijanzadeh、Massoud Amanlou
DOI:10.1016/j.tet.2017.09.042
日期:2017.11
preparation of highly functionalized 1H-imidazoles and 5H-pyrrolo[1,2-c]imidazoles are described. Heating a mixture of an α-azidochalcones and N,N,N′,N′-tetramethyl guanidine under neat conditions gave the corresponding 2,4,5-trisubstituted 1H-imidazole via Michael addition-cyclization in excellent yields. Subsequently, the prepared 1H-imidazoles undergo addition-Wittig reaction with acetylenic esters in presence
描述了用于制备高度官能化的1 H-咪唑和5 H-吡咯并[1,2- c ]咪唑的有效而简便的方法。在纯净的条件下加热α-叠氮hal烷和N,N,N',N'-四甲基胍的混合物,通过迈克尔加成环化以相应的产率得到相应的2,4,5-三取代的1 H-咪唑。随后,在二氯甲烷中在三苯膦存在下,将制得的1 H-咪唑与炔属酯进行加成-Wittig反应,以高收率提供5 H-吡咯并[1,2- c ]咪唑。