反应详情

温度

60 °C

To a solution of 4 (0.241 g, 1.00 mmol) in dry CH2Cl2 (5 mL) was added dropwise iodomethane (0.32 mL, 0.729 g, 5.10 mmol) at room temperature under N2. The reaction mixture was then refluxed at 60° C. under N2 for 1 h. After cooling to room temperature, the mixture was concentrated in vacuo to give the corresponding methyl pyridinium iodide salt as an analytically pure yellow solid (0.382 g, 99.8%). mp 220-221° C.; 1H NMR (400 MHz, CD2Cl2): δ 9.079 (s, 2H), 6.751 (s, 2H), 4.579 (s, 3H), 3.881 (s, 3H), 2.135 (s, 6H), 1.854 (s, 6H); 13C NMR (100 MHz, CD2Cl2): δ 160.512, 159.866, 143.124, 138.802, 135.527, 125.927, 114.217, 55.692, 48.686, 20.188, 17.331; Anal. Calcd. For C17H22INO: C, 53.27; H, 5.79; N, 3.65. Found: C, 53.15; H, 5.79; N, 3.57.

1. temperatureAfter cooling to room temperature
2. concentrationthe mixture was concentrated in vacuo