反应详情

Methyl 4-(4-(4-nitrophenyl)(1,3-thiazol-2-yl))-5-methylthiothiophene-2-carboxylate (800 mg, 2 mmol) was dissolved in 150 mL tetrahydrofuran and treated with 20% titanium chloride solution (Fisher Scientific, Pittsburgh, Pa., USA) for 1 h. The mixture was poured into 2 M sodium hydroxide solution (100 mL), extracted with dichloromethane (4×50 mL). The combined organic layers were washed with saturated brine solution and dried over anhydrous sodium sulfate. The solid was filtered off, and the solvent removed in vacuo. This material was purified by column chromatography on silica gel (30 g) eluting with dichloromethane:methanol 98/2 (v:v) to give methyl 4-(4-(4-aminophenyl)(1,3-thiazol-2-yl))-5-methylthiothiophene-2-carboxylate (500 mg, 69%) as a solid. 1H-NMR (DMSO-d6; 300 MHz) δ8.17 (s, 1H), 7.77 (s, 1H), 7.74 and 6.62 (AB quartet, 2H, J=8.6 Hz), 5.35 (s, 2H), 3.86 (s, 3H), 2.74 (s, 3H). ). Mass spectrum (MALDI-TOF, CHCA matrix, m/z): Calcd. for C16H14N2O2S3 363.0 (M+H), found 362.4.

1. extractionextracted with dichloromethane (4×50 mL)
2. washThe combined organic layers were washed with saturated brine solution
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationThe solid was filtered off
5. customthe solvent removed in vacuo
6. customThis material was purified by column chromatography on silica gel (30 g)
7. washeluting with dichloromethane