C(2)-Functionalization of 1-substituted imidazoles with cyanoacetylenes and aromatic or heteroaromatic aldehydes
作者:Boris A. Trofimov、Ludmila V. Andriyankova、Kseniya V. Belyaeva、Anastasiya G. Mal’kina、Lina P. Nikitina、Oleg A. Dyachenko、Olga N. Kazheva、Grigorii G. Alexandrov、Gennadii V. Shilov、Andrei V. Afonin、Igor’ A. Ushakov
DOI:10.1016/j.tet.2010.11.072
日期:2011.2
a hitherto unknown family of functionalized imidazole derivatives, in up to 62% yield. This three-component manifold represents a novel C(2)-functionalization of the imidazole nucleus involving zwitterionic, carbene and enol ether intermediates. Unlike the analogous reaction with aliphatic aldehydes, which gives enol ethers, in this case the latter undergo the further rearrangement to 3-(2-imidazol
取代的咪唑(取代基为Me,Et,i- Bu,n-己基,(CH 2)2 S–Bu- n,Ph,Bn)与氰基乙炔(3-苯基- 2-丙腈和4-(1-丁氧基乙氧基)-4-甲基-2-戊腈)和芳族或杂芳族醛(苯甲醛,4-CN-苯甲醛,吡啶-3-醛)得到3-(2-咪唑基)- 3-芳基-2-酰基丙烷腈,迄今未知的官能化咪唑衍生物家族,收率高达62%。这种三组分歧管代表一种新颖的C(2)咪唑核的功能化涉及两性离子,卡宾和烯醇醚中间体。与与脂肪醛的类似反应不同,后者产生烯醇醚,在这种情况下,后者进行进一步的重排,生成3-(2-咪唑基)-3-芳基-2-酰基丙腈。