Co2(CO)8-induced domino reactions of ethyl diazoacetate, carbon monoxide and ferrocenylimines leading to 2-(1-ferrocenyl-methylidene)-malonic acid derivatives
作者:János Balogh、Tamás Kégl、Ferenc Ungváry、Rita Skoda-Földes
DOI:10.1016/j.tetlet.2009.06.035
日期:2009.8
Novel 2-(1-ferrocenyl-methylidene)-malonic acid derivatives are obtained upon reacting ethyl diazoacetate, carbon monoxide and ferrocenylimines in the presence of Co2(CO)8 as catalyst under mild conditions. Presumably, the reaction involves three steps taking place in a domino fashion, (i) carbonylation of ethyl diazoacetate leading to a ketene derivative, (ii) [2+2] cycloaddition of the ketene with
使重氮乙酸乙酯,一氧化碳和二茂铁基亚胺在作为催化剂的Co 2(CO)8存在下,在温和条件下反应,可获得新型2-(1-二茂铁基-亚甲基)-丙二酸衍生物。据推测,该反应涉及以多米诺骨牌方式进行的三个步骤:(i)重氮乙酸乙酯的羰基化生成烯酮衍生物,(ii)烯酮与反应混合物中存在的二茂铁亚胺的[2 + 2]环加成反应,从而得到β-内酰胺的形成和(iii)β-内酰胺环的N(1)-C(4)裂解。在大多数情况下,根据亚胺组分的结构,以E-和Z-异构体的可分离混合物的形式获得2-(1-二茂铁基-亚甲基)-丙二酸衍生物。