A Scalable, Enantioselective Synthesis of the α2-Adrenergic Agonist, Lofexidine
摘要:
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.
ENANTIOSELECTIVE SYNTHESIS OF (+) AND (-)-2-[1-(2,6-DICHLOROPHENOXY)-ETHYL]-1,3-DIAZACYCLOPENT-2-3ENE
申请人:Crooks Peter A.
公开号:US20100087657A1
公开(公告)日:2010-04-08
This application provides a method for the enantioselective synthesis of (+) and (−) lofexidine or 2-[1-(2,6)-dichlorophenoxy)-ethyl]-1,3-diazacyclopent-2-ene.