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The preparation of tert-butyldiphenylsilyl ethers is a common, routine procedure (Protective Groups in Organic Synthesis, 3rd edition, 1999, pp. 141-144 and references therein, Greene, T. W. and Wuts, P. G. M., eds, Wiley-Interscience, New York). In general, a solution of one eq. of 7 and imidazole (3.5 eq.) in anhydrous N,N-dimethylformamide (DMF) is treated with tert-butyldiphenylsilyl chloride (1.2 eq.). After stirring at room temperature for several hours, the reaction mixture is poured into ethyl acetate and washed extensively with water and saturated brine solution. The resulting organic solution is dried over anhydrous sodium sulfate, filtered, evaporated, and purified by silica gel chromatography to give Compound 8.

1. customin Organic Synthesis, 3rd edition, 1999
2. washwashed extensively with water and saturated brine solution
3. dry with materialThe resulting organic solution is dried over anhydrous sodium sulfate
4. filtrationfiltered
5. customevaporated
6. custompurified by silica gel chromatography