The reaction of amino-imidazoles, -pyrazoles and -triazoles with α,β-unsaturated nitriles
作者:Sergey A. Komykhov、Konstantin S. Ostras、Alvard R. Kostanyan、Sergey M. Desenko、Valery D. Orlov、Herbert Meier
DOI:10.1002/jhet.5570420612
日期:2005.9
The reactions of α,β-unsaturated nitriles (1, 9, 12) as bielectrophiles with aminoazoles (2, 4, 6) as binu-cleophiles were investigated. Acrylonitrile (1) reacts almost exclusively in a chemoselective Michael-type addition yielding the substituted azoles 3, 5 and 7, respectively. Cinnamonitriles 9a,b behave in a similar way, but the free CN group adds a second molecule 4 yielding 10a,b and its cyclocondensation
α,β不饱和腈(的反应1中,9,12)与aminoazoles(bielectrophiles 2,4,6)作为binU中-cleophiles进行了调查。丙烯腈(1)几乎全部以化学选择性迈克尔型加成反应,分别生成取代的唑3、5和7。肉桂腈9a,b的行为相似,但游离的CN基团添加了第二个分子4,产生10a,b及其环缩合产物11a,b作为次要成分。偶氮嘧啶的形成尝试最好是通过亚苄基丙二腈12a-f与2或4。该过程是化学和区域选择性的。结构确定基于NMR测量,包括DEFT,COSY,ROESY,HMQC和HMBC技术,并更正了先前的建议。