| 摘要 |
A process is disclosed for the separation of an enantiomerically enriched 1-tosyloxy-2-acyloxy-3-butene and an enantiomerically enriched 1-tosyloxy-2-hydroxy-3-butene from a first mixture containing both compounds. The process includes the steps of: (a) forming a solution of the mixture in an organic solvent; (b) bringing the solution formed in (a) to a temperature wherein most of the enantiomerically enriched 1-tosyloxy-2-hydroxy-3-butene precipitates, leaving in solution most of the enantiomerically enriched 1-tosyloxy-2-acyloxy-3-butene; and (c) separating the precipitate formed in (b) from the solution. |
