反应详情

An oven-dried 200 mL round-bottomed flask was charged with chlorosulfonic acid (18.5 mL, 167 mmol). Under N2 flow, compound 10.1 (29.3 g, 139 mmol) was added dropwise using a cannula tube at 0° C., and the reaction was stirred at room temperature for 1.5 h. The reaction mixture was poured into 300 mL of ice-water. Deposited crystals were collected, washed with 3×100 mL of ice-water, and dried in vacuo affording the title compound 10.2 (37.3 g). 1H NMR (300 MHz) (CDCl3) δ 7.86-7.84 (2H, m); 6.80 (1H, t, J=9.5 Hz); 4.76 (2H, s); 4.29 (2H, q, J=7.1 Hz); 2.37 (3H, s); 1.31 (3H, t, J=7.1 Hz).

1. customat 0° C.
2. customDeposited crystals were collected
3. washwashed with 3×100 mL of ice-water
4. customdried in vacuo