Enantioselective Sequential‐Flow Synthesis of Baclofen Precursor via Asymmetric 1,4‐Addition and Chemoselective Hydrogenation on Platinum/Carbon/Calcium Phosphate Composites
Haruro Ishitani, Yuichi Furiya, Shū Kobayashi
Abstract
Continuous-flow synthesis of baclofen precursor (2) was achieved using achiral and chiral heterogeneous catalysts in high yield with high enantioselectivity. The key steps are chiral calcium-catalyzed asymmetric 1,4-addition of a malonate to a nitroalkene and chemoselective reduction of a nitro compound to the corresponding amino compound by using molecular hydrogen. A dimethylpolysilane (DMPS)-modified platinum catalyst supported on activated carbon (AC) and calcium phosphate (CP) has been developed that has remarkable activity for the selective hydrogenation of nitro compounds.
Topics & Concepts
Enantioselective synthesisCatalysisPlatinumMalonateChemistryYield (engineering)Carbon fibersNitroOrganic chemistryCombinatorial chemistryMaterials scienceComposite materialComposite numberAlkylInnovative Microfluidic and Catalytic Techniques InnovationAsymmetric Hydrogenation and CatalysisChemical Synthesis and Analysis