Imidazole → 2-Trimethylsilanylethyl 4-iodopiperidine-1-carboxylate

Temperature

0 °C

12.5 g of 2-trimethylsilanylethyl 4-hydroxypiperidine-1-carboxylate were dissolved in 136 ml of dichloromethane and 264 ml of tetrachloromethane. The solution was cooled to 0° C. and then 16 g of triphenylphosphine, 4.2 g of imidazole and 15.8 g of iodine were successively added. The mixture was slowly allowed to reach room temperature and was stirred for 14 h. Then 300 ml of a saturated sodium thiosulfate solution were added to the solution. The mixture was stirred until it was colorless. The aqueous phase was then extracted twice with 200 ml of dichloromethane each time. The combined organic phases were washed once with 200 ml of a saturated sodium thiosulfate solution and once with 200 ml of a saturated sodium chloride solution. After drying with MgSO4, the solvents were removed in vacuo, and the residue was purified by chromatography on silica gel.

1. customto reach room temperature
2. stirringThe mixture was stirred until it
3. extractionThe aqueous phase was then extracted twice with 200 ml of dichloromethane each time
4. washThe combined organic phases were washed once with 200 ml of a saturated sodium thiosulfate solution and once with 200 ml of a saturated sodium chloride solution
5. dry with materialAfter drying with MgSO4
6. customthe solvents were removed in vacuo
7. customthe residue was purified by chromatography on silica gel

ORD record

ord-ae1253acfd9b4616a04e9986b8c09090

Source dataset

uspto-grants-2006_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07008957B2