Réaction #1857552

Équation de réaction

(2R,3S)-2-benzyl-3((4-methoxybenzyl)oxy)butan-1-ol

DMSO

→

title compound

Rendement 99.2%

(2S,3S)-2-benzyl-3((4-methoxybenzyl)oxy)butanal

Rendement 99.2%

Solvants

CH2Cl2

Conditions de réaction

Traitement

1. 1
   Autrefollowed by sulfur trioxode-pyridine complex (8.55 g, 53.7 mmol) in three equal portions at 0° C. under N2
2. 2
   AutreThe reaction was removed from the cold bath
3. 3
   workup.ADDITIONThe reaction was diluted with ice cold 0.5 N HCl (100 mL) and EtOAc (150 mL)
4. 4
   AutreThe phases were separated
5. 5
   Lavagethe organic phase was washed with sat. aq. NaHCO3 (50 mL) and brine (50 mL)
6. 6
   SéchageThe solution was dried over magnesium sulfate (MgSO4)
7. 7
   Filtrationfiltered
8. 8
   Concentrationconcentrated

Mode opératoire

To a solution of (2R,3S)-2-benzyl-3((4-methoxybenzyl)oxy)butan-1-ol (5.38 g, 17.91 mmol) in CH2Cl2 (90 mL) in a nitrogen flushed 250 mL round bottomed flask was added DMSO (17.9 mL, 25.24 mmol) and TEA (12.5 mL, 90 mmol) via syringe followed by sulfur trioxode-pyridine complex (8.55 g, 53.7 mmol) in three equal portions at 0° C. under N2. The reaction was removed from the cold bath and allowed to warm to room temperature, and stirred for 2 h. The reaction was diluted with ice cold 0.5 N HCl (100 mL) and EtOAc (150 mL). The phases were separated and the organic phase was washed with sat. aq. NaHCO3 (50 mL) and brine (50 mL). The solution was dried over magnesium sulfate (MgSO4), filtered, and concentrated to afford the title compound (5.3 g, 96%) as a yellow oil: 1H NMR (400 MHz, CDCl3) δ 9.78 (d, J=2.8 Hz, 1H), 7.29-7.09 (m, 7H), 6.89 (d, J=8.7 Hz, 2H), 4.56 (d, J=11.3 Hz, 1H), 4.34 (d, J=11.3 Hz, 1H), 3.82 (s, 3H), 3.03 (dd, J=14.0, 8.2 Hz, 1H), 2.87 (dd, J=14.0, 6.4 Hz, 2H), 2.78-2.55 (m, 1H), 1.29 (d, J=6.4 Hz, 3H); ESIMS m/z 321.3 ([M+Na]+).

Source