710.00 mg (2.48 mmol) 2-hydroxy-1-(2-phenyl-6,7-dihydro-4H-oxazolo[5,4-c]pyridin-5-yl)-butan-1-one are placed in 10 mL DMF and combined with 340.00 mg (4.99 mmol) imidazole. Then 600.00 mg (3.98 mmol) tert.-butyl-chloro-dimethyl-silane and 30.00 mg (0.25 mmol) DMAP are added and the mixture is stirred overnight at RT. The DMF is eliminated i.V., the residue is added to DCM and extracted 1 time each with H2O, 1N HCl and saturated sodium chloride solution. The solvent of the org. phase is eliminated in vacuo and the residue is purified on silica gel. (Eluant: cyclohexane/EA).
