反应详情

温度

5 °C

0.40 g (0.63 mmol) of (3S,4R,5R)-4-(4-allyloxy-phenyl)-3-[(S)-2,2-dimethyl-[1,3]dioxolan-4-ylmethoxy]-5-(4-methoxy-naphthalen-2-ylmethoxy)-piperidine-1-carboxylic acid tert-butyl ester, 1.4 mg (0.0063 mmol) of palladium-II-acetate and 3.3 mg (0.0126 mmol) of triphenylphosphin were dissolved in 2 ml of tetrahydrofuran. After cooling to 5° C., 21.7 mg (0.947 mmol) of lithiumborohydride were added and the reaction mixture stirred for 4 hours without cooling. Thereafter, the reaction mixture was again cooled to 5° C. and treated with 0.32 ml of acetone, then diluted with 5 ml of saturated sodium hydrogen carbonate solution and extracted twice with 5 ml of ether. The combined organic phases were washed once with a small amount of water, dried over magnesium sulphate, evaporated under reduced pressure and dried in a high vacuum. The thus-obtained crude product was separated on silica gel using a mixture of dichloromethane/ethyl acetate (4/1) as the eluent and yielded 0.343 g (0.578 mmol), 91.5%, (3S,4R,5R)-3-[(4S)-2,2-dimethyl-[1,3]dioxolan-4-ylmethoxy]-4-(4-hydroxy-phenyl)-5-(4-methoxy-naphthalen-2-ylmethoxy)-piperidine-1-carboxylic acid tert-butyl ester as colorless oil; MS: 594 (M+H)+.

1. temperaturewithout cooling
2. temperatureThereafter, the reaction mixture was again cooled to 5° C.
3. extractionextracted twice with 5 ml of ether
4. washThe combined organic phases were washed once with a small amount of water
5. dry with materialdried over magnesium sulphate
6. customevaporated under reduced pressure
7. customdried in a high vacuum
8. customThe thus-obtained crude product
9. customwas separated on silica gel using
10. additiona mixture of dichloromethane/ethyl acetate (4/1) as the eluent