Stereochemistry of the Reaction Intermediates of Prolinol Ether Catalyzed Reactions Characterized by Vibrational Circular Dichroism Spectroscopy
| Autor: | Christian Merten, Tino P. Golub |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Asymmetric Catalysis
Oxazolidine Reaction mechanism Circular dichroism 010405 organic chemistry Stereochemistry Communication Organic Chemistry chirality General Chemistry Reaction intermediate 010402 general chemistry 01 natural sciences Communications vibrational spectroscopy Catalysis circular dichroism 0104 chemical sciences Enamine Prolinol chemistry.chemical_compound chemistry Vibrational circular dichroism Physical organic chemistry enamines |
| Zdroj: | Chemistry (Weinheim an Der Bergstrasse, Germany) |
| ISSN: | 1521-3765 0947-6539 |
| DOI: | 10.1002/chem.201905614 |
| Popis: | Spectroscopic characterizations of key reaction intermediates are often considered the final confirmation of a reaction mechanism. This proof‐of‐principle study showcases the application of vibrational circular dichroism (VCD) spectroscopy for the characterization of in situ generated reaction intermediates using the key intermediates of enamine catalysis of Jørgensen–Hayashi‐type prolinol ether catalysts as model system. By comparison of experimental and computed spectra, the enamines are shown to preferentially adopt an anti‐conformation with E‐configured C=C bond. For the parent prolinol catalyst, the structure and stereochemistry of the oxazolidine side product is determined as well. This study thus demonstrates that VCD spectra can provide insights into structural preferences of organocatalysts that utilize a covalent activation mechanism. Thereby it outlines new fields of applications for VCD spectroscopy and finally adds the technique to the toolbox of physical organic chemistry for in‐depth mechanistic studies. Before it reacts: The enamine and oxazolidine intermediates are characterized by in situ IR and VCD spectroscopy. The study demonstrates the proof‐of‐principle for such analysis of asymmetric catalysts employing a covalent substrate activation mechanism by VCD spectroscopy.Stereochemistry of the reaction intermediates of prolinol ether catalyzed reactions characterized by vibrational circular dichroism spectroscopy (Merten and Golub @MertenLab @ruhrunibochum) |
| Databáze: | OpenAIRE |
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