A Scalable, Enantioselective Synthesis of the α<sub>2</sub>-Adrenergic Agonist, Lofexidine
作者:Ashish P. Vartak、Peter A. Crooks
DOI:10.1021/op8002689
日期:2009.5.15
A scalable and high-yielding synthetic route toward pure enantiomers of the alpha(2)-adrenergic agonist, lofexidine hydrochloride, is presented. Salient features include a rapid one-pot amide alkylation-imidazoline formation sequence on the carboxamide function of alpha-(2,6-dichlorophenoxy)propionamide, while preserving the sensitive configuration about the alpha-carbon of the resulting product. A means to accelerate the sluggish O-alkylation of the carboxamide function of alpha-(2,6-dichlorophenoxy)propionamide by Me3O+BF4- is also described, which may be of general applicabitity.