An Enantioselective Synthesis of (<i>S</i>)-(+)-3-Aminomethyl-5-methylhexanoic Acid via Asymmetric Hydrogenation
作者:Mark J. Burk、Pieter D. de Koning、Todd M. Grote、Marvin S. Hoekstra、Garrett Hoge、Rex A. Jennings、William S. Kissel、Tung V. Le、Ian C. Lennon、Thomas A. Mulhern、James A. Ramsden、Robert A. Wade
DOI:10.1021/jo034397b
日期:2003.7.1
A concise enantioselective synthesis of (S)-(+)-3-aminomethyl-5-methylhexanoic acid (1, Pregabalin) has been developed. The key step is the asymmetric hydrogenation of a 3-cyano-5-methylhex-3-enoic acid salt 2 with a rhodium Me-DuPHOS catalyst, providing the desired (S)-3-cyano-5-methylhexanoate 3 in very high ee. Subsequent hydrogenation of the nitrile 3 with a heterogeneous nickel catalyst provides
Highly Selective Asymmetric Hydrogenation Using a Three Hindered Quadrant Bisphosphine Rhodium Catalyst
作者:Garrett Hoge、He-Ping Wu、William S. Kissel、Derek A. Pflum、Derek J. Greene、Jian Bao
DOI:10.1021/ja048496y
日期:2004.5.1
synthesis of both enantiomers of ligand2 and rhodium complex 5 is presented. The crux of the synthesis is a chiral HPLC separation of the enantiomers of 4. Rhodium complex 5 possesses three hindered quadrants in the steric environment within which a substrate binds. Evidence is presented that this configuration leads to high enantioselectivity (>99% ee) for rhodium-catalyzed asymmetric hydrogenation of
This invention provides a method of making (S)-(+)-3-(aminomethyl)-5-methylhexanoic acid (pregabalin) or a salt thereof via an asymmetric hydrogenation synthesis. Pregabalin is useful for the treatment and prevention of seizure disorders, pain, and psychotic disorders. The invention also provides intermediates useful in the production of pregabalin.