Even alkyl methyl ketones undergo asymmetric hydrogenation with high enantioselectivity when a rhodium complex of the conformationally rigid chiral ligand 1 (Me-PennPhos; R=CH3 ) is used as the catalyst. Basic additives such as 2,6-lutidine contribute to the achievement of high enantiomeric excesses.
当使用构象刚性手性配体1的铑配合物(Me-PennPhos; R = CH 3)作为催化剂时,即使烷基甲基酮也经历高对映选择性的不对称氢化。碱性添加剂(例如2,6-二甲基吡啶)有助于实现高对映体过量。
Syntheses of Novel Chiral Monophosphines, 2,5-Dialkyl-7-phenyl-7-phosphabicyclo- [2.2.1]heptanes, and Their Application in Highly Enantioselective Pd-Catalyzed Allylic Alkylations