Regio- and Stereoselective Intermolecular Hydroalkoxylation of Alkynes Catalysed by Cationic Gold(I) Complexes
作者:Avelino Corma、Violeta R. Ruiz、Antonio Leyva-Pérez、María J. Sabater
DOI:10.1002/adsc.201000094
日期:——
levels of stereoselectivity by using cationic gold(I)‐phosphine complexes as catalysts. By choosing the appropriate phosphine, the selective formation of the Z or the E isomer of the vinyl ether can be tuned, and the undesired formation of the ketal can be controlled. The isomerisation of fumarates (Z‐isomer) to maleates (E‐isomer) is a gold‐catalysed process that can be conducted in one‐pot. When
乙烯基醚和缩酮是通过使用阳离子金(I)-膦配合物作为催化剂,以良好的收率和立体选择性水平从苯乙炔衍生物和乙炔二羧酸二甲酯(DMAD)与醇反应制得的。通过选择合适的膦,可以调节乙烯基醚的Z或E异构体的选择性形成,并且可以控制缩酮的不期望的形成。富马酸酯(Z-异构体)到马来酸酯(E-异构体)的异构化是金催化的过程,可以在一个罐中进行。当使用多元醇时,通过用己烷萃取很容易将五元环状缩酮分离出来,并且金的络合物可以重复使用。