Reaktion #1885043

Reaktionsgleichung

sodium potassium tartaric acid

(R)-3-(tert-butyldiphenylsilyloxy)-dihydrofuran-2(3H)-one

aniline

trimethylaluminum

→

(R)-2-(tert-butyldiphenylsilyloxy)-4-hydroxy-N-phenylbutanamide

Ausbeute 78.4%

Lösungsmittel

DCM

DCM

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe reaction mixture was stirred at RT for 16 hours
2. 2
   workup.STIRRINGstirred for 15 min
3. 3
   SonstigeThe layers were separated
4. 4
   Waschenthe aqueous layer was washed with DCM (4×)
5. 5
   WaschenThe combined organics were washed with 0.1M HCl (2×), brine
6. 6
   Trocknendried over Na2SO4
7. 7
   Sonstigeevaporated to dryness
8. 8
   SonstigePurification by silica gel chromatography (10-30% EtOAc in hexane)

Vorschrift

To a solution of aniline (356 mg, 348 μL, 3.82 mmol) in DCM (17 mL) was added trimethylaluminum (2.0M, 2.1 mL, 4.2 mmol) dropwise and the reaction mixture was stirred at RT for 40 min. A solution of (R)-3-(tert-butyldiphenylsilyloxy)-dihydrofuran-2(3H)-one (1.00 g, 2.94 mmol) in DCM (12 mL) was added dropwise and the reaction mixture was stirred at RT for 16 hours. The reaction mixture was poured into a saturated solution of sodium potassium tartaric acid and stirred for 15 min. The layers were separated, and the aqueous layer was washed with DCM (4×). The combined organics were washed with 0.1M HCl (2×), brine, dried over Na2SO4 and evaporated to dryness. Purification by silica gel chromatography (10-30% EtOAc in hexane) afforded the (R)-2-(tert-butyldiphenylsilyloxy)-4-hydroxy-N-phenylbutanamide (1.00 g, 78%). LC/MS (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)), m/z: M+1 obs=434.7; tR=2.16 min.

Quelle