反应详情

This intermediate (2.5 g, 9.28 mmol) was treated with oxalyl chloride (4.1 mL, 46.4 mmol), DMF (2 drops) in methylene chloride (70 mL) and stirred at room temperature for 2 hours to give 1-ethyl-4-(3-methoxy-phenylethynyl)-1H-pyrrole-2-carboxylic acid chloride (2.7 g, 9.38 mmol) after a usual workup. 1-Ethyl-4-(3-methoxy-phenylethynyl)-1H-pyrrole-2-carboxylic acid chloride (2.7 g, 9.38 mmol) was diluted with methylene chloride (35 mL) and added to a prepared solution of N,O, dimethyl-hydroxylamine hydrochloride (4.6 g, 46.4 mmol) and diisopropyl-ethyl amine (13 mL, 74.3 mmol) in methylene chloride (35 mL) over 5 minutes. The reaction was complete after 4 hours. Solvent was removed in vacuo and the residue was taken back in a mixture of saturated aqueous NH4Cl: H2O (1:1, 150 mL) solution and extracted with ether. Combined ether extracts were washed with brine dried (MgSO4) and filtered. Evaporation and purification by flash chromatography (hexane/ethyl acetate 9/1) gave the title compound as a light yellow oil (2.48 g g, 82% yield), 1H NMR (400 MHZ, CDCl3) □ 1.35-1.37 (t, 3H), 3.31 (s, 3H), 3.67 (s, 3H), 3.78 (s, 3H), 4.29-4.30 (q, 2H), 6.83 (m, 1H), 6.99 (m, 2H), 7.01 (m, 2H), 7.19 (m, 1H), MS m/e (M+H)+ 313.1.

1. customSolvent was removed in vacuo
2. additionthe residue was taken back in a mixture of saturated aqueous NH4Cl: H2O (1:1, 150 mL) solution
3. extractionextracted with ether
4. washCombined ether extracts were washed with brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. customEvaporation and purification by flash chromatography (hexane/ethyl acetate 9/1)