Rhodium catalysed asymmetric hydroformylation with diphosphite ligands based on sugar backbones
作者:Godfried J.H. Buisman、Marti E. Martin、Eric J. Vos、Angélique Klootwijk、Paul C.J. Kamer、Piet W.N.M. van Leeuwen
DOI:10.1016/0957-4166(95)00068-z
日期:1995.3
used in the rhodium catalysed asymmetric hydroformylation of styrene. Enantioselectivities up to 64% have been obtained with stable hydridorhodium diphosphite dicarbonyl catalysts (HRhPP(CO)2). High regioselectivities (up to 97%) to the branched aldehyde were found at relatively mild reaction conditions (T = 25–40°C, 9–45 bar of syngas pressure). The solution structures of HRhPP(CO)2 catalysts have been
从(2,2'-联苯-1,1'-二基)制备的手性二亚磷酸酯配体(PP),(4,4',6,6'-四-吨-丁基-2,2'-联苯1 1,1'-二基),4,4'-二-吨-丁基-6,6'-二甲氧基-2,2'-联苯-1,1'-二基)和二(2-吨丁基,6-甲基苯基)} phosphorochloridites和糖骨架1,2- ö异亚丙基d呋喃木糖,甲基-2,3- ö异亚丙基α -D-吡喃甘露糖苷和(甲基-3,6-脱水)-α-D-甘露吡喃糖苷,α-D-吡喃葡萄糖苷和β-D-吡喃半乳糖苷}已用于铑催化的苯乙烯的不对称加氢甲酰化反应。使用稳定的亚磷酸氢二钠二羰基催化剂(HRhPP(CO)2)。在相对温和的反应条件下(T = 25–40°C,合成气压力为9–45 bar),发现对支链醛的区域选择性高(高达97%)。通过31 P和1 H NMR光谱研究了HRhPP(CO)2催化剂的溶液结构。二亚磷酸酯配体与铑中