Development of Practical Rhodium Phosphine Catalysts for the Hydrogenation of β-Dehydroamino Acid Derivatives
作者:Stephan Enthaler、Giulia Erre、Kathrin Junge、Jens Holz、Armin Börner、Elisabetta Alberico、Ilenia Nieddu、Serafino Gladiali、Matthias Beller
DOI:10.1021/op0602270
日期:2007.5.1
The rhodium-catalyzed asymmetric hydrogenation of various β-dehydroamino acid derivatives to give optically active β-amino acids has been examined. Chiral monodentate 4,5-dihydro-3H-dinaphthophosphepines, which are easily tuned and accessible in a multi-10-g scale, have been used as ligands. The enantioselectivity is largely dependent on the nature of the substituent at the phosphorous atom and on
已经研究了铑催化的各种β-脱氢氨基酸衍生物的不对称氢化,以产生光学活性的β-氨基酸。手性单齿4,5-二氢-3 H-二萘并吡啶类易配体已被轻松调配,并且可在多至10 g的范围内使用。对映选择性主要取决于磷原子上取代基的性质以及底物的结构。应用了高达94%ee的优化条件。