N-异丁叉亚甲基胺与甲氧基亚甲基丙二酸二甲酯反应,仅得到N-烷基化产物3a。将席夫氏碱的N-取代基从甲基交换为叔丁基会改变反应过程,从而使Michael加成反应主要发生。与肼基链烷醇6a,b,6c,d和6e反应的迈克尔加合物4c得到四氢吡唑并[5,1 - b ]恶唑9a,b,四氢吡唑并[5,1- b ] [1,3]恶嗪9c,d和六氢吡唑并[5,1- b ] [1,3]奥氮平9e, 分别。
Michael addition of<i>N</i>-isobutylidene-<i>t</i>-butylamine to dimethyl methoxymethylenemalonate and a new synthesis of some fused pyrazole derivatives from the adduct
作者:Kunio Ito、Shogo Ihara、Shingo Miyajima
DOI:10.1002/jhet.5570300613
日期:1993.12
N-Isobutylidenemethylamine reacted with dimethyl methoxymethylenemalonate to afford the N-alkylation product 3a exclusively. Exchanging the N-substituent of the Schiff's base from methyl to t-butyl altered the course of the reaction, allowing Michael addition to take place predominantly. The Michael adduct 4c on reaction with hydrazinoalkanols 6a,b, 6c,d and 6e gave tetrahydropyrazolo[5,1-b]oxazoles
N-异丁叉亚甲基胺与甲氧基亚甲基丙二酸二甲酯反应,仅得到N-烷基化产物3a。将席夫氏碱的N-取代基从甲基交换为叔丁基会改变反应过程,从而使Michael加成反应主要发生。与肼基链烷醇6a,b,6c,d和6e反应的迈克尔加合物4c得到四氢吡唑并[5,1 - b ]恶唑9a,b,四氢吡唑并[5,1- b ] [1,3]恶嗪9c,d和六氢吡唑并[5,1- b ] [1,3]奥氮平9e, 分别。