反应详情

温度

75 °C

To 2-(isopropylthio)-5-nitrobenzaldehyde (234 mg, 1.0 mmol) and (S)-(+)-p-toluenesulfinamide (161 mg, 1.0 mmol) in CH2Cl2 (10 mL) was added Ti(OEt)4 (25% tech, 0.54 mL). The mixture was heated at 75° C. for 3.0 h. TLC indicated a clean reaction. Solvent was removed and the residue was redissolved in EtOAc, under stirring sat. Na2SO4 solution was added and the slurry was stirred at rt for 30 min before it was filtered through a pad of Celite®. The filtrate was extracted with EtOAc, washed with brine and dried over Na2SO4. After evaporation of solvent, 98A (320 mg, 88% yield) was obtained as a solid used for next step without further purification. 1H NMR (400 MHz, CDCl3) δ ppm 1.34 (d, J=6.59 Hz, 6H) 2.34 (s, 3H) 3.51-3.61 (m, 1H) 7.27 (d, J=7.91 Hz, 2H) 7.45 (d, J=8.79 Hz, 1H) 7.59 (d, J=8.35 Hz, 2H) 8.14 (dd, J=8.79, 2.64 Hz, 1H) 8.69 (d, J=2.64 Hz, 1H) 9.17 (s, 1H).

1. customa clean reaction
2. customSolvent was removed
3. dissolutionthe residue was redissolved in EtOAc, under stirring sat. Na2SO4 solution
4. additionwas added
5. filtrationwas filtered through a pad of Celite®
6. extractionThe filtrate was extracted with EtOAc
7. washwashed with brine
8. dry with materialdried over Na2SO4
9. customAfter evaporation of solvent