反应详情

To 1,2-dimethoxyethane (1.00 L) solution of 250 g of 5-bromobenzothiophene were added 276 g of potassium tert-butoxide and 174 g of tert-butyl cyanoacetate. Thereto were added 8.23 g of dichlorobis(triphenylphosphine)palladium(II) and 6.15 g of triphenylphosphine at 80 to 85° C., which was then refluxed for 2 hours. Next, to the reaction mixture were added 500 mL of ethylene glycol, 250 mL of water and 263 g of potassium hydroxide, which was then refluxed for 4 hours. To the reaction mixture were added 1.50 L of water and 12.5 g of kieselguhr (cellpure, product of Advanced Minerals Company). After insoluble matter was filtered off, to the filtrate was added 250 mL of toluene, and the aqueous layer was separated. To the aqueous layer were added 375 mL of toluene and 375 mL of ethyl acetate, the pH was adjusted to 1 with 505 mL of hydrochloric acid, and the organic layer was separated. The organic layer was treated with 12.5 g of activated carbon. The solvent was distilled off under reduced pressure, to which was added toluene. The precipitate was collected by filtration to provide 176 g of 2-(1-benzothiophen-5-yl)acetic acid as white solid form.

1. temperaturewhich was then refluxed for 2 hours
2. temperaturewas then refluxed for 4 hours
3. filtrationAfter insoluble matter was filtered off, to the filtrate
4. additionwas added 250 mL of toluene
5. customthe aqueous layer was separated
6. additionTo the aqueous layer were added 375 mL of toluene and 375 mL of ethyl acetate
7. customthe organic layer was separated
8. additionThe organic layer was treated with 12.5 g of activated carbon
9. distillationThe solvent was distilled off under reduced pressure, to which
10. additionwas added toluene
11. filtrationThe precipitate was collected by filtration