反应详情

To a 50 ml round bottomed flask with a stirring bar was added n-butyl 5-(4-(1,1-dimethylethoxycarbonyl)-piperazin-1-yl)-thiophene-2-carboxylate (490 mg, 1.33 mmol) and 4.2 mL of a 2.5M NaOH solution in 3:1 MeOH/H2O. THF (2 mL) was added to keep the reaction homogeneous. The reaction was stirred at room temperature and followed by HPLC. After 2 days, the reaction was concentrated in vacuo, acidified with 10% citric acid and extracted with EtOAc (3×). The combined organics were washed with water (1×), brine (1×), dried (Na2SO4), filtered, and the solvents removed in vacuo. The product was azeotroped with benzene (3×) and dried in vacuo over 2 days to yield 5-(4-(1,1-dimethylethoxycarbonyl)-piperazin-1-yl)-thiophene-2-carboxylic acid as a dark green solid.

1. concentrationthe reaction was concentrated in vacuo
2. extractionextracted with EtOAc (3×)
3. washThe combined organics were washed with water (1×), brine (1×)
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. customthe solvents removed in vacuo
7. customThe product was azeotroped with benzene (3×)
8. customdried in vacuo over 2 days