Potassium Permanganate → 2-Methyl 1H-pyrrole-2,4-dicarboxylate

関与物質

反応手順

To a solution of 4-formyl-1H-pyrrole-2-carboxylic acid methyl ester (589 mg) in acetone/water (50 mL, 1:1) was added a solution of KMnO4 in acetone/water (70 mL, 1:1) dropwise within one hour. The mixture was stirred for 3 h at RT whereupon it was poured into a solution of NaHSO3 (10% in 1 N HCl, 100 mL). The resulting mixture was extracted with ethyl acetate. The combined organic phases were washed with water and extracted with 2N aqueous K2CO3 solution. The basic aqueous phase was acidified with 2N HCl and extracted with ethyl acetate The combined organic phases were dried (MgSO4) and concentrated in vacuo to provide 1H-pyrrole-2,4-dicarboxylic acid 2-methyl ester (530 mg) which was used directly in the next step.

情報源と証拠