反应详情

Oxalyl chloride (1.12 mL, 12.8 mmol) was added dropwise to a solution of 2,4,6-triisopropylphenyl acetic acid (3.05 g, 11.6 mmol) in 150 mL toluene with 4 drops of N,N-dimethylformamide as a catalyst. The resulting solution was stirred overnight and then concentrated in vacuo. The residue was re-dissolved in 150 mL dichloromethane. 3,5-Bis(1-methylethyl)-4-(sulfamoyloxy)benzoic acid methyl ester (3.48 g, 11.6 mmol) and triethylamine (4.0 mL) were added and the resulting mixture was stirred for 2 hours. Washed with 1 M HCl, dried the organic layer over magnesium sulfate, filtered, and concentrated to give an off-white foam. Recrystallized (hexanes) to give 5.21 g of the title compound as a white solid; mp 144-146° C.

1. concentrationconcentrated in vacuo
2. dissolutionThe residue was re-dissolved in 150 mL dichloromethane
3. stirringthe resulting mixture was stirred for 2 hours
4. washWashed with 1 M HCl
5. dry with materialdried the organic layer over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customto give an off-white foam
9. customRecrystallized (hexanes)