反应详情

温度

-78 °C

In a 22 L RBF, charge 4-Chlorosulfonyl-benzoyl chloride (990 g, 4.159 mole) in 8.3 L THF and cool to −78° C. In an addition funnel charge triethylamine (588 ml, 4.159 mole), methanol (168 ml, 4.159 mole), DMAP (5 g, 0.041 mole) and 4 L THF; add this solution dropwise to the reaction keeping the exotherm <−70° C. over 5 hours. After the addition is complete, stir the reaction in a cold bath overnight. Filter the reaction and rinse with 3×500 ml THF. Concentrate under vacuum the filtrate to give a yellow solid. Dissolve the solid in 7 L EtOAc and 7 L 1N HCl. Separate the organic layer and wash with 5 L brine. Dry the organics over Na2SO4, filter and concentrate under vacuum to give a white solid, 4-Chlorosulfonyl-benzoic acid methyl ester. Yield=93.1% (906 g).

1. additionadd this solution dropwise to the reaction
2. customthe exotherm <−70° C.
3. customover 5 hours
4. additionAfter the addition
5. customthe reaction in a cold bath overnight
6. filtrationFilter
7. customthe reaction
8. washrinse with 3×500 ml THF
9. concentrationConcentrate under vacuum the filtrate
10. customto give a yellow solid
11. customSeparate the organic layer
12. washwash with 5 L brine
13. dry with materialDry the organics over Na2SO4
14. filtrationfilter
15. concentrationconcentrate under vacuum