反应详情

To a stirring solution of compound 2.6 (1.77 g, 7.5 mmol), Pd(PPh3)2Cl2 (262 mg, 0.37 mmol), CuI (143 mg, 0.75 mmol), and DIPEA (2.9 g, 22.5 mmol) in THF (50 mL) was added compound 2.8 (1.84 g, 10.5 mmol) under an argon atmosphere, and the mixture was stirred at room temperature for 5 hr. The solvent was removed under reduced pressure, and the resulting residue was diluted with water (100 mL) and extracted with EtOAc (3×150 mL). The combined organic layers were dried and concentrated under reduced pressure to give a red oil, which was purified by flash chromatography (silica gel/PE:EA 5:1˜3:1) to yield methyl 4-(4-(((trans)-2-(hydroxymethyl)cyclopropyl)buta-1,3-diyn-1-yl)phenyl)picolinate (2.9, 570 mg, 23%): MS: m/z calcd for C21H17NO3 331.12. found [M+H]+ 332; 1H-NMR (DMSO-d6, 400 MHz) δ 8.77 (d, J=5.6 Hz, 1H), 8.30 (s, 1H), 7.99 (d, J=5.6 Hz, 1H), 7.90 (d, J=8.4 Hz, 2H), 7.67 (d, J=8.4 Hz, 2H), 4.72 (t, J=5.6 Hz, 1H), 3.91 (s, 3H), 3.44 (m, 1H), 3.24 (m, 1H), 1.45 (m, 2H), 0.88 (m, 2H).

1. customThe solvent was removed under reduced pressure
2. additionthe resulting residue was diluted with water (100 mL)
3. extractionextracted with EtOAc (3×150 mL)
4. customThe combined organic layers were dried
5. concentrationconcentrated under reduced pressure
6. customto give a red oil, which
7. customwas purified by flash chromatography (silica gel/PE:EA 5:1˜3:1)