Hydrochloric Acid → (2S)-1-allyloxycarbonyl-2-t-butyldimethylsilyloxymethyl-4-oxo-pyrrolidine

Temperatur

-70 °C

To a solution of oxalyl chloride (0.18 ml) in dichloromethane (10 ml) was added dropwise a solution of dimethyl sulfoxide (0.3 ml) in dichloromethane (2 ml) at -60° C. After stirring at -70° C. for 30 minutes, to the mixture was added dropwise a solution of (2S,4R)-1-allyloxycarbonyl-2-t butyldimethylsilyloxymethyl-4-hydroxypyrrolidine (0.6 g) in dichloromethane (5 ml) at -60° C. After stirring at -70° C. for 30 minutes, to the mixture was added dropwise triethylamine (1.3 ml) and the resulting mixture was allowed to warm to ° C. and diluted with ethyl acetate (150 ml) and brine. After adjusting pH to around 3 with 10% hydrochloric acid, the organic layer was separated, washed with brine, dried over magnesium sulfate and evaporated. The residue was chromatographed on silica gel (50 ml) eluting with 15% ethyl acetate in hexane to give (2S)-1-allyloxycarbonyl-2 -t-butyldimethylsilyloxymethyl-4-oxo-pyrrolidine (0.54 g).

1. stirringAfter stirring at -70° C. for 30 minutes, to the mixture
2. temperatureto warm
3. customthe organic layer was separated
4. washwashed with brine
5. dry with materialdried over magnesium sulfate
6. customevaporated
7. customThe residue was chromatographed on silica gel (50 ml)
8. washeluting with 15% ethyl acetate in hexane

ORD-Eintrag

ord-ebac188ba42d4e999a7d9c57180e4dbf

Quelldatensatz

uspto-grants-1990_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04923857