반응 #2200585

반응 방정식

water

(2R,3S)-2-methyl-3-benzyloxybutanol

Et3N

ether

→

(2S,3S)-2-methyl-3-benzyloxybutyraldehyde

용매

DMSO

반응 조건

후처리

1. 1
   workup.WAITat room temperature for 2 hours
2. 2
   추출The aqueous layer was extracted with ether
3. 3
   세척The combined ether extracts were washed with 1M HCl, waters saturated NaHCO3, brine, and they
4. 4
   건조were dried over Na2SO4
5. 5
   기타evaporated in order

실험 절차

The Py.SO3 complex (4.09 g, 25.67 mmol, 6.0 eq.) was added in portions at 0° C. to a solution of (2R,3S)-2-methyl-3-benzyloxybutanol (13) (830 mg, 4.28 mmol) and Et3N (2.86 g, 3.93 ml, 28.25 mmol, 6.6 eq.) in DMSO (14 ml). The reaction mixture is stirred at 0° C. for 3.5 hours, and then at room temperature for 2 hours, and then it was divided between water and ether. The aqueous layer was extracted with ether. The combined ether extracts were washed with 1M HCl, waters saturated NaHCO3, brine, and they were dried over Na2SO4 and evaporated in order to obtain crude (2S,3S)-2-methyl-3-benzyloxybutyraldehyde which was used directly for the next reaction without purification. 1H NMR (250 MHz, CDCl3) δ 9.73 (d, J=2.4 Hz, 1H); 4.63 (d, J=11.7 Hz, 1H); 4.44 (d, J=11.7 Hz, 1H); 3.81 (quintuplet, J=6.4 Hz, 1H); 2.57 (quintuplet-d, J=7.0; 2.4 Hz, 1H); 1.25 (d, J=6.2 Hz, 3H); 1.09 (d, J=7.1 Hz, 3H).

출처