Abstract
An effective resolving agent, (2S, 3S)-di-O-(p-toluoyl) tartaric acid(4), was screened using a 'family' approach to yield direct resolution of (R)-terbutaline (1) with high optical purity and yield. Molecular recognition was studied by X-ray crystallographic analyses of the single crystals of the pair of diastereomeric salts. The more-soluble salt formed a sheet supramolecular structure, and the less-soluble salt formed a columnar supramolecular structure by enantiodifferentiating self-assembly. The water molecule plays an important role during optical resolution, and makes the supramolecular structure of the less-soluble salt more thermodynamically stable than that of the more-soluble salt. Solvent system has little influence on the resolution.
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