Asymmetric, rhodium-catalyzed hydroformylation of terminal and internal aryl alkenes with diazaphospholane ligands is reported. Under partially optimized reaction conditions, high enantioselectivity (>90% ee) and regioselectivities (up to 65:1 alpha:beta) are obtained for most substrates. For terminal alkenes, both enantioselectivity and regioselectivity are proportional to the carbon monoxide partial
报道了带有二氮杂
磷烷
配体的
铑和不饱和
铑催化的末端和内部芳基烯烃的加氢甲酰化反应。在部分优化的反应条件下,大多数底物均具有高对映选择性(> 90%ee)和区域选择性(最高65:1α:β)。对于末端烯烃,对映选择性和区域选择性均与
一氧化碳分压成比例,但与氢压无关。对位取代的
苯乙烯衍
生物的加氢甲酰化作用对带有吸电子取代基的底物具有最高的区域选择性。Hammett分析得出区域选择性呈正线性相关。