反应详情

Following procedure A, 2-chloro-5-nitropyridine (303 mg, 1.91 mmol, 1.00 eq) and 4-tert-pentylphenol (397 mg, 2.42 mmol, 1.27 eq) were dissolved in DMSO (6 mL). Anhydrous K2CO3 (403 mg, 2.92 mmol, 1.53 eq) was added and the reaction mixture was stirred at room temperature for 7 h. After extraction with Et2O, the crude product was purified by flash column chromatography (SiO2; EtOAc/petrolether 1:100) to afford the title compound as colourless solid (530 mg, 1.85 mmol, 97% yield). Rf=0.31 (EtOAc/PE 1:20). HRMS (ESI) calcd. for C16H19N2O3+ [M+H]+ 287.1390. found: 287.1381. 1H NMR (400 MHz, CDCl3) δ 9.07-9.05 (m, 1H, aromatic H), 8.45 (dd, J=9.4, 2.4 Hz, 1H, aromatic H), 7.40 (d, J=8.6 Hz, 2H, aromatic H), 7.09 (d, J=8.6 Hz, 2H, aromatic H), 6.99 (d, J=9.2 Hz, 1H, aromatic H), 1.67 (q, J=7.4 Hz, 2H, Ar—C(CH3)2CH2CH3), 1.31 (s, 6H, Ar—C(CH3)2CH2CH3), 0.73 (t, J=7.4 Hz, 3H, Ar—C(CH3)2CH2CH3). 13C NMR (101 MHz, CDCl3) δ 167.17, 150.46, 147.34, 145.20, 140.27, 134.90, 127.56, 120.72, 111.28, 37.89, 37.06, 28.55, 9.26.

1. extractionAfter extraction with Et2O
2. customthe crude product was purified by flash column chromatography (SiO2; EtOAc/petrolether 1:100)