An Unusual Michael Addition of 3,3-Dimethoxypropanenitrile to 2-Aryl Acrylates: A Convenient Route to 4-Unsubstituted 5,6-Dihydropyrido[2,3-<i>d</i>]pyrimidines
作者:Xavier Berzosa、Xavier Bellatriu、Jordi Teixidó、José I. Borrell
DOI:10.1021/jo902345r
日期:2010.1.15
An unusual Michael addition between 2-aryl-substituted acrylates and 3,3-dimethoxypropanenitrile which leads, depending on the reaction temperature (60 or −78 °C, respectively), to a 4-methoxymethylene-substituted 4-cyanobutyric ester or to a 4-dimethoxymethyl 4-cyanobutyric ester is described. These compounds can be subsequently converted to 4-unsubstituted pyrido[2,3-d]pyrimidines upon treatment
2-芳基取代的丙烯酸酯和3,3-二甲氧基丙腈之间的不寻常的迈克尔加成,这取决于反应温度(分别为60或-78°C),导致生成4-甲氧基亚甲基取代的4-氰基丁酸酯或描述了4-二甲氧基甲基4-氰基丁酸酯。在微波辐射下用胍系统处理后,这些化合物可随后转化为4-未取代的吡啶并[2,3- d ]嘧啶。