To a solution of (COCl)2 (3.4 ml) in CH2Cl2 (100 ml) was dropwise added DMSO (3.7 ml) at −78° C. After 10minutes, a solution of (1R,2R)-1-[3-(tertbutyldiphenylsilyloxy)benzyl]-1,2-dihydroxycyclohexane (12 g) in CH2Cl2(50 ml) was added to the above mixture at the same temperature. After 10 minutes, the mixture was added with triethylamine (15 ml) and allowed to stand at room temperature. After evaporating the solvent, the residue was partitioned between EtOAc and water. The organic layer was washed with water and brine. The organic solvent was evaporated in vacuo to give an oily compound. The oily compound was dissolved in DMF (50 ml) and then added with trimethylsilychloride (6.6 ml) and imidazole(7.0 g) at room temperature. After stirring for 5 hours, the mixture was partitioned between EtOAc and water. The organic solvent was evaporated in vacuo. The residue was purified by chromatography on silica gel to give (R)-1-[3-(tertbutyldiphenylsilyloxy)benzyl]-1-trimethylsilyoxy-2-cyclohexanone (1.15 g).
