Highly functionalized pyrimidines can be prepared in good yields, by a one-pot procedure, fromcyanogen and β-dicarbonylcompounds at ambient conditions in dichloroethane in the presence of catalytic amounts of Ni(acac)2 or Cu(acac)2. The pyrimidines obtained were fully characterized by a variety of physicochemical methods. The presence of at least one keto group in the substrate appears to be a necessary
在室温下,在催化量的Ni(acac)2或Cu(acac)2存在下,在室温条件下,由氰和β-二羰基化合物通过一锅法,可以高收率制备高官能度的嘧啶。通过各种物理化学方法充分表征了获得的嘧啶。底物中存在至少一个酮基似乎是成功合成的必要条件,例如对于丙二酸二甲酯而言,合成失败。利用Cu(acac)进行了2-(1-氨基-2-乙酰丁-1-烯丙基)-4-羧酰胺基-5-乙酰基-6-甲基-1,3-二嗪合成的动力学研究。2作为催化剂。催化过程中的关键步骤是C 2的插入反应N 2进入金属配位的3-cyanoiminomethylpentane-2,4-dionato配体的C H甲氨酸键中,从而导致碳-碳键的形成。该过程表征了这种新的嘧啶合成,通常,以前已知的闭环反应仅暗示碳-氮键的形成。发现C 2 N 2与乙酰丙酮的简单加成产物3-cyanoiminominopentpentane-2,4-dione起着重要的