反应详情

A solution of 4-bromo-2-methyl-benzoic acid isopropyl ester (Intermediate 117, 6.12 g, 23.8 mmol) in carbon tetrachloride (120 mL) was treated with N-bromosuccinimide (4.6 g, 26.18 mmol) and 2,2′-azobisisobutyronitrile (0.6 g) and the resulting reaction mixture was refluxed overnight. It was cooled to ambient temperature, the solids were filtered off and washed with 1:1 hexane:diethyl ether, and the filtrate and washings were evaporated in vacuo to afford an oil (5.1 g, 64%) that was used as such for the next step.

1. customthe resulting reaction mixture
2. temperaturewas refluxed overnight
3. filtrationthe solids were filtered off
4. washwashed with 1:1 hexane
5. customdiethyl ether, and the filtrate and washings were evaporated in vacuo