To a solution of 2-[6-(benzothiazol-2-yloxy)-benzofuran-3-yl]-ethanol (0.32 g, 1.0 mmol) in DCM (15 mL) was added 4-dimethylaminopyridine (13 mg, 0.10 mmol), DIEA (0.22 mL, 1.2 mmol) and Ms2O (0.22 g, 1.2 mmol) and the resulting solution was stirred (rt, 15 min). The reaction mixture was diluted with DCM (40 mL). The organic layer was washed with saturated NH4Cl (2×50 mL), brine (2×50 mL), dried, filtered and concentrated in vacuo to provide the title compound as a clear oil (0.41 g, 100%). MS (ESI): mass calcd. for C18H15NO5S2, 389.5; m/z found, 390.1 [M+H]+.
