Optically active salithion (>98% e.e.) was obtained via an L-proline methyl ester derivative (PS), whose diastereomers were easily separated, with subsequent sulfuric acid-catalyzed methanolysis. The configuration of each diastereomeric PS was determined by NMR and single-crystal X-ray analysis. The optical purity of each PS and of the salithion enantiomers was measured by 1H-NMR and HPLC, respectively. The sulfuric acid-catalyzed methanolysis of PS to salithion was confirmed to have proceeded with an inversion of the configuration at the phosphorus atom by an experiment using model compounds.
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)
- Agricultural and Biological Sciences(all)