2,4-Disubstituted 4-Oxoalkanenitriles and 3-Cyanoalkane-1,5-diones via Michael-Addition of Lithioacetonitrile to 2-(N-Methylanilino)acrylonitrile. A Regioselective Four Component Coupling Reaction A new method for the synthesis of the title compounds by a one-pot reaction is described. It consists of the regioselective alkylation of a 1,3-dithio derivative of 3-cyanopropionaldehyde. The key intermediate is prepared by addition of lithioacetonitrile to 2-(N-methylanilino) acrylonitrile and subsequent lithiation. In a similar way, synthesis of symmetrical 3-cyanoalkane-1,5-diones is possible.
2,4-二取代4-氧代烷腈和3-
氰基烷-1,5-二酮通过
锂乙腈对2-(
N-甲基苯胺基)
丙烯腈的迈克尔加成。一种区域选择性四组分偶联反应。描述了一种通过一锅反应合成标题化合物的新方法。它包括3-
氰基
丙醛的1,3-二
硫衍
生物的区域选择性烷基化。关键中间体是通过将
锂乙腈添加到2-(
N-甲基苯胺基)
丙烯腈并随后进行
锂化而制备的。以类似的方式,可以合成对称的3-
氰基烷-1,5-二酮。