反应详情

4-[(Benzo[b]thiophene-3-yl)carbonyl]-1-piperidinecarboxylic acid, 1,1-dimethylethyl ester ##STR13## Dissolve benzo[b]thiophene (23 g, 0.170 mmol) in carbon tetrachloride (80 mL). Add, by dropwise addition, a solution of bromine (26.85 g, 0.168 mmol) in carbon tetrachloride (30 mL) and stir at room temperature for 2 days. Quench with a 1M solution of sodium thiosulfate and separate the organic phase. Extract the aqueous phase with carbon tetrachloride, combine the organic phases and dry (MgSO4). Evaporate the solvent in vacuo and purify by distillation to give 3-bromobenzo[b]thiophene as a pale yellow liquid (17.33 g, 48%); bp 64°-72° C. @ 0.02 mm Hg.

1. additionAdd, by dropwise addition
2. customQuench with a 1M solution of sodium thiosulfate
3. customseparate the organic phase
4. extractionExtract the aqueous phase with carbon tetrachloride
5. dry with materialdry (MgSO4)
6. customEvaporate the solvent in vacuo
7. distillationpurify by distillation