Methyl tetra - 0-methyl- ?-D- glucopyranoside is stereoselectively prepared from tetramethyl-D- glucopyranose by using (MeI+NaH) in toluene (86%) or cyclohexane (85%), while its ?- isomer is best synthesized in hexamethyl phosphoramide (64%). Similarly, methyl tetra-o-methyl-?- D-mannopyranoside is synthesized in cyclohexane (80%), while its ?- isomer is predominantly prepared by (MeI+n-Bu...

In the title compound, C(12)H(15)NO(6)S, the aromatic ring is oriented at dihedral angles of 64.76 (11) and 56.42 (13)° with respect to the planar methyl ester unit and the SO(2) group, respectively. The dihedral angle between the SO(2) group and the planar methoxy-carbonyl-methyl group is 50.42 (14)°. Intra-molecular C-H⋯O hydrogen bonding results in the formation of an eight-membered ring. In...