反应详情

温度

-78 °C

At −78° C., titanium(iv) chloride (1.0 M solution in DCM) (17.8 mL, 17.8 mmol) was added slowly to a solution of (R)-3-acetyl-4-benzyloxazolidin-2-one (available from Aldrich) (3.55 g, 16.2 mmol) in DCM (80 mL), followed by slow addition of diisopropylethyl amine (3.38 mL, 19.4 mmol). The mixture was stirred at −78° C. for 30 minutes and then a solution of (E)-1-((3-(2-nitrovinyl)phenoxy)methyl)benzene (94.1A) (4.13 g, 16.2 mmol) (commercially available from Aldrich) in DCM (17 mL) was added dropwise (over 15 minutes). Then TiCl4 (16 mL, 1.0 M solution in DCM) was added slowly to the reaction. The mixture was stirred at −78° C. for 2 hours and then quenched with NH4Cl solution. The mixture was extracted with EtOAc (350 mL) and the organic phase was washed with sodium bicarbonate solution and brine, dried over anhydrous Na2SO4. After removing solvent, the residue was recrystallized from MeOH, 94.1B (727 mg), white solid was obtained. MS ESI (np0s.) m/e: 475 (M+H)+.

1. stirringThe mixture was stirred at −78° C. for 2 hours
2. customquenched with NH4Cl solution
3. extractionThe mixture was extracted with EtOAc (350 mL)
4. washthe organic phase was washed with sodium bicarbonate solution and brine
5. dry with materialdried over anhydrous Na2SO4
6. customAfter removing solvent
7. customthe residue was recrystallized from MeOH, 94.1B (727 mg)
8. customwhite solid was obtained