The catalytic asymmetric aldol reaction of silyl ketene acetals with aldehydes in the presence of a chiral borane complex. Nitroethane as a highly effective solvent for catalytic conditions
作者:Syun-ichi Kiyooka、Yuichi Kaneko、Ken-ichi Kume
DOI:10.1016/s0040-4039(00)61236-4
日期:1992.8
Catalytic asymmetric aldol reactions of silyl ketene acetals with aldehydes in the presence of 20 mol % of the chiral borane reagent, prepared in situ from the p-nitrobenzenesulfonamide of (S)-valine and BH3·THF complex, gave β-hydroxy carboxylic acid esters in good chemical yields along with excellent enantioselectivity under conditions that employ nitroethane as an effective solvent.
由(S)-缬氨酸的对硝基苯磺酰胺和BH 3 ·THF配合物原位制备的手性硼烷试剂在20摩尔%的存在下,硅酮烯酮缩醛与醛的催化不对称醛醇缩醛反应,得到β-羟基羧酸在使用硝基乙烷作为有效溶剂的条件下,该酯具有良好的化学收率以及出色的对映选择性。