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100 mg of this ester were dissolved in 5 ml of absolute tetrahydrofuran and treated under argon with 104 mg of tetrakis-(triphenylphosphine)-palladium and 61 mg of tributyltin hydride. After stirring at room temperature for 30 min., the reaction mixture was poured on to ice/saturated ammonium chloride solution, acidified with 1N hydrochloric acid and extracted with ethyl acetate. The dark oil obtained after drying and evaporation was purified by chromatography (RP18-LiChroprep, acetonitrile) and recrystallization from ethyl acetate. There were obtained 21 mg of 6-[3-adamantan-1-yl-4-(tert-butyl-dimethyl-silanyloxy)-benzoyloxy]-nicotinic acid in colorless crystals, m.p. 188°-190° C.

1. additionthe reaction mixture was poured on to ice/saturated ammonium chloride solution
2. extractionextracted with ethyl acetate
3. customThe dark oil obtained
4. customafter drying
5. customevaporation
6. customwas purified by chromatography (RP18-LiChroprep, acetonitrile) and recrystallization from ethyl acetate