| abstract |
The present invention relates to methods for the preparation of diastereomerically pure (3R,3aS,6aR)hexahydro-furo[2,3-b]furan-3-ol as well as a novel intermediate, (3aR,4S,6aS)4-methoxy-tetrahydro-furo[3,4-b]furan-2-one for use in said methods. More in particular the invention relates to a stereoselective method for the preparation of diastereomerically pure (3R,3aS,6aR)hexahydro-furo[2,3-b]furan-3-ol, as well as methods for the crystallization of (3aR,4S,6aS)4-methoxy-tetrahydro-furo[3,4-b]furan-2-one and for the epimerization of (3aR,4R,6aS)4-methoxy-tetrahydro-furo[3,4-b]-furan-2-one to (3aR,4S,6aS)4-methoxy-tetrahydro-furo[3,4-b]furan-2-one. |