Triethylamine → HCID 57457960, Verbindung

Temperatur

0 °C

A solution of 32.35 g (226 mmol) of (S)4,4-dimethyl-2-hydroxymethyl-5-oxopyrrolidine in 300 ml of tetrahydrofuran was added dropwise over a period of 20 minutes with ice-cooling and stirring to keep the temperature between 8 and 17° C., to a suspension of 25.72 g (678 mmol) of lithium aluminum hydride in 500 ml of tetrahydrofuran. The resulting mixture was then heated under reflux for 7 hours, at the end of which time it was cooled to 0° C. and 103 ml of a 4% aqueous solution of sodium hydroxide were added carefully thereto. Any insoluble material was removed by filtration and the filtrate was concentrated by evaporation under reduced pressure. The residue thus obtained was dissolved in 500 ml of methylene chloride and then 40.94 ml (294 mmol) of triethylamine were added, followed by the further addition of 38.71 ml (271 mmol) of benzyloxycarbonyl chloride with ice-cooling and stirring. The resulting mixture was stirred for 1 hour at the same temperature and then stirred for a further 1 hour at room temperature. At the end of this time, a saturated aqueous solution of sodium hydrogencarbonate was added to the reaction mixture, and it was then extracted with methylene chloride. The organic extract was washed with water, dried over anhydrous magnesium sulfate and then concentrated by evaporation under reduced pressure. The resulting residue was purified by chromatography on a silica gel column using a 1:1 by volume mixture of hexane and ethyl acetate as the eluant to afford 43.97 g (yield: 74%) of the title compound as a colorless oil.

1. temperaturecooling
2. customthe temperature between 8 and 17° C.
3. temperatureThe resulting mixture was then heated
4. temperatureunder reflux for 7 hours, at the end of which time it
5. customAny insoluble material was removed by filtration
6. concentrationthe filtrate was concentrated by evaporation under reduced pressure
7. customThe residue thus obtained
8. temperaturecooling
9. stirringstirring
10. stirringThe resulting mixture was stirred for 1 hour at the same temperature
11. stirringstirred for a further 1 hour at room temperature
12. extractionwas then extracted with methylene chloride
13. extractionThe organic extract
14. washwas washed with water
15. dry with materialdried over anhydrous magnesium sulfate
16. concentrationconcentrated by evaporation under reduced pressure
17. customThe resulting residue was purified by chromatography on a silica gel column
18. additionby volume mixture of hexane and ethyl acetate as the eluant

ORD-Eintrag

ord-d9fcd09e0c9f4c14aa09dca367658567

Quelldatensatz

uspto-grants-2006_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07122666B2