反应详情

温度

0 °C

To a stirred solution of carboxylic acid 14 (600 mg, 2.2 mmol), ether (4.0 mL), and pyridine (2 drops) at ambient temperature was added thionyl chloride in one portion to effect an exotherm. After 25 minutes the ether, pyridine, and thionyl chloride were evaporated. The intermediate acid chloride was dissolved in ether (5 mL), cooled to 0° C., then treated with an ethereal solution of diazomethane (15 mL, ~10 mmol). After 2.0 hours the excess diazomethane was removed by purging with argon. Evaporation in situ gave a solid that was dissolved in CH3OH (10 mL) then treated sequentially with NEt3 (0.5 mL) and silver benzoate (20 mg). After 15 minutes the black reaction mixture was concentrated and the residue subjected to flash chromatography (silica, 10% ethyl acetate/hexanes) to give 15 (300 mg) as an oil.

1. customAfter 25 minutes the ether, pyridine, and thionyl chloride were evaporated
2. dissolutionThe intermediate acid chloride was dissolved in ether (5 mL)
3. customAfter 2.0 hours the excess diazomethane was removed
4. customby purging with argon
5. customEvaporation in situ
6. customgave a solid
7. concentrationAfter 15 minutes the black reaction mixture was concentrated