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5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(thieno[3,2-b:2′,3′-d]thiophen-2-yl)pyrazin-2-amine

5-[4-(tert-Butyldimethylsilyloxy)phenyl]-3-(dithieno[3,2-b:2′,3′-d]thiophen-2-yl)pyrazin-2-amine

2-[4-(tert-butyldimethylsilyloxy)phenyl]acetyl chloride

water

→

Compound 11l

수율 20.9%

2-[4-(tert-Butyldimethylsilyloxy)phenyl]-N-[5-{4-(tert-butyldimethylsilyloxy)phenyl}-3-(dithieno[3,2-b:2′,3′-d]thiophen-2-yl)pyrazin-2-yl]acetamide

수율 20.9%

용매

pyridine

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후처리

1. 1
   기타prepared above at 0° C.
2. 2
   온도the mixture was heated
3. 3
   온도After cooling to room temperature
4. 4
   추출the product was extracted with ethyl acetate (100 mL×3)
5. 5
   추출The combined organic extract
6. 6
   세척was washed successively with water (200 mL) and brine (200 mL)
7. 7
   건조by drying over anhydrous sodium sulfate
8. 8
   여과After filtration and concentration under reduced pressure
9. 9
   기타the residue was purified by column chromatography (silica gel 50 g, n-hexane/ethyl acetate=3/1)
10. 10
    기타The resulting solid was recrystallized (n-hexane/ethyl acetate)

실험 절차

Under an argon atmosphere, to a mixture of 5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(thieno[3,2-b:2′,3′-d]thiophen-2-yl)pyrazin-2-amine (7l) (370 mg, 746 μmol) and 4-(dimethylamino)pyridine (14.8 mg, 121 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 20 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 50 g, n-hexane/ethyl acetate=3/1). The resulting solid was recrystallized (n-hexane/ethyl acetate) to give Compound 11l (116 mg, 156 μmol, 20.9%) as a brown solid. Rf=0.19 (n-hexane/ethyl acetate=3/1); 1H NMR (400 MHz, DMSO-d6) δ 0.16 (s, 6H), 0.21 (s, 6H), 0.93 (s, 9H), 0.94 (s, 9H), 3.68 (s, 2H), 6.78-6.88 (AA′BB′, 2H), 6.94-7.06 (AA′BB′, 2H), 7.20-7.30 (AA′BB′, 2H), 7.47 (d, 1H, J=5.2 Hz), 7.65 (s, 1H), 7.75 (d, 1H, J=5.2 Hz), 8.06-8.14 (AA′BB′, 2H), 8.93 (s, 1H), 10.72 (s, 1H); IR (KBr, cm−1) 530, 602, 644, 700, 779, 837, 922, 1072, 1171, 1265, 1361, 1447, 1504, 1603, 1657, 2857, 2928, 2955, 3208.

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