Catalytic asymmetric carbon–carbon bond forming reactions catalyzed by tetrahydroisoquinoline (TIQ) N,N′-dioxide ligands
作者:Zamani E.D. Cele、Sphelele C. Sosibo、Pher G. Andersson、Hendrik G. Kruger、Glenn E.M. Maguire、Thavendran Govender
DOI:10.1016/j.tetasy.2013.01.004
日期:2013.2
The use of TIQ-N,N′-dioxide ligands in asymmetric C–C bond forming reactions is described. In the Michael addition of cyclohexane-1,3-dione and malonates to β,γ-unsaturated α-ketoesters, excellent yields (up to 93%) and moderate to good enantioselectivities (70–89% ee) were obtained. The catalytic hetero-ene reaction of 2-methoxypropene with phenylglyoxal gave the ene product in excellent yield (95%)
描述了在不对称C–C键形成反应中使用TIQ- N,N'-二氧化物配体。将环己烷-1,3-二酮和丙二酸酯迈克尔添加到β,γ-不饱和α-酮酸酯中,可获得优异的收率(高达93%)和中等至良好的对映选择性(70-89%ee)。2-甲氧基丙烯与苯基乙二醛的催化杂烯反应以优异的收率(95%)和中等的对映选择性(77%ee)得到了烯产物。催化剂体系在0至30°C的温度范围内表现良好,催化剂负载量相对较低(0.2-5 mol%),其中二氯甲烷是所有反应的优选溶剂。