Reacción #2348657

Ecuación de reacción

sodium potassium tartaric acid

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

aniline

trimethylaluminum

→

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

Rendimiento 78.4%

Disolventes

DCM

DCM

Condiciones de reacción

Tratamiento posterior

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

Procedimiento

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.

Fuente