Tributylstannane → 1-Acetyl-4-hydroxy-4-tributylstannyl-piperidine

Temperatur

-70 °C

Under an inert atmosphere, 0.32 mmol of n-butyllithium (1.6M in hexane) is added over a period of 5 minutes to a solution of 0.32 mmol of diisopropylamine in 750 ml of tetrahydrofuran at 0° C. After stirring the mixture for 15 minutes, 0.32 mmol of tri-n-butyltin hydride is added. After 1 hour 30 minutes at 0° C., the reaction mixture is cooled to −70° C. and 0.26 mmol of N-acetylpiperidone in 225 ml of tetrahydrofuran is added and the reaction mixture is then diluted by adding 380 ml of tetrahydrofuran. After stirring for 2 hours 30 minutes, the reaction mixture is hydrolysed by the addition of 200 ml of an aqueous 10% solution of NaH2PO4, brought to 0° C., and then diluted with 2 litres of ether and 1 litre of water. After decanting and washing with a saturated NaCl solution, the organic phase is dried and filtered and then concentrated under reduced pressure. Chromatography on silica gel (dichloromethane) enables the expected product to be isolated.

1. waitAfter 1 hour 30 minutes at 0° C.
2. additionthe reaction mixture is then diluted
3. stirringAfter stirring for 2 hours 30 minutes
4. custombrought to 0° C.
5. customAfter decanting
6. washwashing with a saturated NaCl solution
7. customthe organic phase is dried
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. customto be isolated

ORD-Eintrag

ord-48b30a64647741d78e22309aab19e1fd

Quelldatensatz

uspto-grants-2002_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06399616B1