[2+2] Carbonylative cycloaddition catalyzed by palladium: stereoselective synthesis of β-lactams
作者:Luigino Troisi、Luisella De Vitis、Catia Granito、Tullio Pilati、Emanuela Pindinelli
DOI:10.1016/j.tet.2004.05.079
日期:2004.8
[2+2] Carbonylative cycloaddition of chiral imines to various allyl halides, under CO pressure, in the presence of Et3N, a catalytic amount of Pd(OAc)2 and PPh3 as ligand, are carried out. Separable diastereomeric mixtures of chiral alkenyl-β-lactams are isolated with good yields and high trans diastereoselections. Absolute configurations are assigned by X-ray measurements and 1H NMR spectroscopy.
[2 + 2]在Et 3 N存在下,在CO压力下,在CO压力下,将手性亚胺羰基化成环烷基加成各种烯丙基卤,催化量的Pd(OAc)2和PPh 3作为配体。手性烯基-β-内酰胺的可分离的非对映异构体混合物具有良好的收率和较高的反式非对映体选择性。通过X射线测量和1 H NMR光谱确定绝对构型。