반응 #324386

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5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(naphthalen-2-yl)pyrazin-2-amine

5-[4-(tert-Butyldimethylsilyloxy)phenyl]-3-(naphthalen-2-yl)pyrazin-2-amine

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

water

→

Compound 11e

수율 58.2%

2-[4-(tert-Butyldimethylsilyloxy)phenyl]-N-[5-{4-(tert-butyldimethylsilyloxy)phenyl}-3-(naphthalen-2-yl)pyrazin-2-yl]acetamide

수율 58.2%

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 (200 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)

실험 절차

Under an argon atmosphere, to a mixture of 5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(naphthalen-2-yl)pyrazin-2-amine (7e) (500 mg, 1.17 mmol) and 4-(dimethylamino)pyridine (15.0 mg, 123 μmol) dissolved in anhydrous pyridine (20 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 16 hours. After cooling to room temperature, to this was added water and the product was extracted with ethyl acetate (200 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) to give Compound 11e (460 mg, 681 μmol, 58.2%) as a yellow foamy solid. Rf=0.26 (n-hexane/diethyl ether=2/3); 1H NMR (400 MHz, DMSO-d6) δ 0.12 (s, 6H), 0.21 (s, 6H), 0.91 (s, 9H), 0.94 (s, 9H), 3.46 (s, 2H), 6.55-6.65 (AA′BB′, 2H), 6.91-6.97 (AA′BB′, 2H), 6.97-7.03 (AA′BB′, 2H), 7.47-7.58 (m, 2H), 7.75-8.00 (m, 4H), 8.08-8.14 (AA′BB′, 2H), 8.23 (s, 1H), 9.00 (s, 1H), 10.63 (s, 1H); 13C NMR (75.5 MHz, DMSO-d6) δ −4.6 (4C), 17.8, 17.9, 25.5 (6C), 119.4 (2C), 120.3 (2C), 125.5, 126.1, 126.6, 127.1, 127.2, 127.3, 127.5, 127.9, 128.2 (2C), 128.5, 130.2 (2C), 132.6, 132.8, 135.3, 137.6, 143.0, 147.5, 148.0, 153.7, 156.7, 169.4 (one carbon at the benzyl position was unobservable due to overlapping with the septet peak of DMSO); IR (KBr, cm−1) 478, 527, 687, 718, 746, 781, 804, 839, 914, 1009, 1082, 1103, 1128, 1169, 1261, 1362, 1415, 1445, 1472, 1508, 1605, 1670, 2857, 2886, 2928, 2955, 3057, 3221; HRMS (ESI+) m/z 698.3194 ([M+Na]+, C40H49N3NaO3Si2+ requires 698.3205).

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