反应详情

温度

-78 °C

Dissolve N-[2-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-1-oxo-3-phenylpropyl]-O-2-propenyl-L-serine, methyl ester (13 g, 29.8 mmol) in methylene chloride/methanol (10:1, 220 mL). Cool to -78° C. and sparge with a mixture of ozone/oxygen for approximately 10 minutes until a blue color persists. Sparge with nitrogen for 10 minutes at -78° C. to remove excess ozone. Treat with methyl sulfide (60 mL, 0.82 mol) and allow to warm to room temperature. Stir at room temperature for 2.5 hours, evaporate the solvent in vacuo and dissolve the residue in ethyl acetate (200 mL). Wash with water, saturated sodium chloride, dry (MgSO4) and evaporate the solvent in vacuo to give the intermediate N-[2-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-1-oxo-3-phenylpropyl]-O-2-oxoethyl-L-serine, methyl ester as a foam (13.6 g).

1. customsparge with a mixture of ozone/oxygen for approximately 10 minutes until a blue color persists
2. customSparge with nitrogen for 10 minutes at -78° C.
3. customto remove excess ozone
4. temperatureto warm to room temperature
5. customevaporate the solvent in vacuo
6. dissolutiondissolve the residue in ethyl acetate (200 mL)
7. washWash with water, saturated sodium chloride
8. dry with materialdry (MgSO4)
9. customevaporate the solvent in vacuo