A Silica‐Supported Catalyst Containing 9‐Amino‐9‐deoxy‐9‐epi‐Quinine (cas 130-95-0) and a Benzoic Acid Derivative for Stereoselective Batch and Flow Heterogeneous Reactions
-
Add time:09/27/2019 Source:infona.pl
A heterogeneous, silica‐based catalyst containing 9‐amino‐9‐deoxy‐epi‐quinine (or quinidine) and a derivative of benzoic acid was synthesized through radical thiol‐ene click reaction. The acid component allows the in situ activation of cinchona amino group, acting as a bifunctional catalyst. The heterogenized catalysts efficiently promoted the reaction of ketones with trans‐β‐nitrostyrene, with diastereo‐ and enantioselectivity comparable to those of the homogeneous counterparts (dr up to 90:10 and 90 % ee). In addition, the catalyst retained a constant activity for at least four cycles. Finally, the supported catalyst (9‐amino‐9‐deoxy‐epi‐quinine/achiral acid) was employed under continuous‐flow conditions. Two enantioselective Michael reactions were in sequence performed with the same homemade packed‐bed reactor. The addition of cyclohexanone to trans‐β‐nitrostyrene provided the evaluation of optimal residence time with high level of stereoselection (2 µL/min flow rate, 83 % ee). Furthermore, the flow reactor well performed in the preparation of warfarin (isolated yield 95 %, 78 % ee. in 16 h at room temperature). The dual (chiral amine/achiral acid) solid supported system, making an even easier work‐out, represents a valuable tool for green chemistry and is attractive for large scale applications.
We also recommend Trading Suppliers and Manufacturers of Quinine (cas 130-95-0). Pls Click Website Link as below: cas 130-95-0 suppliers
Prev:Study of stereoselective interactions of carbamoylated Quinine (cas 130-95-0) and quinidine with 3,5‐dinitrobenzoyl α‐amino acids using VCD spectroscopy in the region of CH stretching vibrations
Next:Stationary phase-related investigations of Quinine (cas 130-95-0)-based zwitterionic chiral stationary phases operated in anion-, cation-, and zwitterion-exchange modes) - 【Back】【Close 】【Print】【Add to favorite 】
- Related Information
- Novel carbamoyl type Quinine (cas 130-95-0) and quinidine based chiral anion exchangers implementing alkyne–azide cycloaddition immobilization chemistry09/30/2019
- Monolithic column functionalized with Quinine (cas 130-95-0) derivative for anion‐exchange capillary electrochromatography09/29/2019
- Investigations of mobile phase contributions to enantioselective anion- and zwitterion-exchange modes on Quinine (cas 130-95-0)-based zwitterionic chiral stationary phases09/28/2019
- Stationary phase-related investigations of Quinine (cas 130-95-0)-based zwitterionic chiral stationary phases operated in anion-, cation-, and zwitterion-exchange modes10/01/2019
- Study of stereoselective interactions of carbamoylated Quinine (cas 130-95-0) and quinidine with 3,5‐dinitrobenzoyl α‐amino acids using VCD spectroscopy in the region of CH stretching vibrations09/26/2019
- Quinine (cas 130-95-0)‐Derived Imidazolidin‐2‐imine Ligands: Synthesis, Coordination Chemistry, and Application in Catalytic Transfer Hydrogenation09/25/2019
-
Health and Chemical more >