2,4-Disubstituierte 4-Oxoalkannitrile und 3-Cyano-1,5-diketone durch Michael-Addition von Lithioacetonitrile an 2-(<i>N</i>-methylanilino)acrylnitril. Eine regioselektive Vierkomponentenkupplung
作者:Hubertus Ahlbrecht、Marcellinus Ibe
DOI:10.1055/s-1987-28127
日期:——
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。