Facile Synthesis of <i>ortho</i>-Halo-Substituted 4-Aryl-2-Aminobutyric Acids
作者:Alexander Heim-Riether
DOI:10.1055/s-2008-1032194
日期:2008.3
Herein we describe an efficient and practical route for the regioselective synthesis of 4-(5-bromo/chloropyrazol-1-yl)-2-aminobutyric acids. The compounds have been prepared by regioselective C-5 halogenation of 1-(3,3-dimethoxypropyl)-1H-pyrazole followed by a Strecker synthesis. In addition, Boc-protected 2-amino-4-(2-chlorophenyl)butyric acid and 2-amino-4-(3-chloropyridin-2-yl)butyric acid have been synthesized.