반응 #324398
ord-18bba774a3814f2d8a9f4a7d72ee16cd
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후처리
- 1기타prepared above at 0° C.
- 2온도the mixture was heated
- 3온도After cooling to room temperature
- 4추출the product was extracted with ethyl acetate (100 mL×3)
- 5추출The combined organic extract
- 6세척was washed successively with water (200 mL) and brine (200 mL)
- 7건조by drying over anhydrous sodium sulfate
- 8여과After filtration and concentration under reduced pressure
- 9기타the residue was purified by column chromatography (silica gel 30 g, n-hexane/ethyl acetate=3/1)
실험 절차
Under an argon atmosphere, to a mixture of 5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(thieno[3,2-b]thiophen-2-yl)pyrazin-2-amine (7k) (250 mg, 569 μmol and 4-(dimethylamino)pyridine (12.3 mg, 101 μmol) dissolved in anhydrous pyridine (15 mL) was added 2-[4-(tert-butyldimethylsilyloxy)phenyl]acetyl chloride (10) prepared above at 0° C. and the mixture was heated with stirring at 50° C. for 13 hours. After cooling to room temperature, to this was added water and the product was extracted with ethyl acetate (100 mL×3). The combined organic extract was washed successively with water (200 mL) and brine (200 mL), followed by drying over anhydrous sodium sulfate. After filtration and concentration under reduced pressure, the residue was purified by column chromatography (silica gel 30 g, n-hexane/ethyl acetate=3/1) to give Compound 11k (228 mg, 331 μmol, 58.2%) as a yellow solid. Rf=0.26 (n-hexane/ethyl acetate=3/1); 1H NMR (400 MHz, DMSO-d6) δ 0.17 (s, 6H), 0.22 (s, 6H), 0.93 (s, 9H), 0.95 (s, 9H), 3.67 (s, 2H), 6.78-6.86 (AA′BB′, 2H), 6.96-7.04 (AA′BB′, 2H), 7.20-7.30 (AA′BB′, 2H), 7.41 (d, 1H, J=5.2 Hz), 7.57 (s, 1H), 7.73 (d, 1H, J=5.2 Hz), 8.04-8.13 (AA′BB′, 2H), 8.92 (s, 1H), 10.69 (s, 1H); IR (KBr, cm−1) 527, 635, 702, 779, 837, 918, 1007, 1074, 1169, 1256, 1362, 1445, 1508, 1603, 1655, 2857, 2886, 2928, 2955, 3211.