反应详情

3-Hydroxy-2-methyl-4H-pyran-4-one (1.0 g, 7.9 mmol) was reacted with benzenesulfonyl chloride (3.0 mL, 23.7 mmol) in 75 mL of pyridine to afford PZBG-2a in 71% yield (1.50 g, 5.6 mmol). 1H NMR (500 MHz, CDCl3) δ=8.12 (d, J=8.6 Hz, 2H), 7.69 (t, J=7.5 Hz, 1H), 7.65 (d, J=5.8 Hz, 1H), 7.58 (t, J=8.0 Hz, 2H), 6.33 (d, J=5.2 Hz, 1H), 2.46 (s, 3H, CH3). 13C NMR (100 MHz, CDCl3) δ=172.1, 163.1, 154.3, 138.4, 136.6, 134.7, 129.2, 129.0, 117.7, 16.3. ESI-MS(+): m/z 267.06 [M+H]+, 289.03 [M+Na]+.

1. customto afford PZBG-2a in 71% yield (1.50 g, 5.6 mmol)