反应详情

A solution of the product from Example 4 (11.7 g, 32.8 mmol) and 3N HCl (400 mL) was heated to reflux for 4 hours. Upon cooling to room temperature, the solids were filtered, washed with 3N HCl and diethyl ether, and air dried to give the title compound (7.8 g, 77% yield) as a yellow solid, mp-305-307° C.

1. temperatureto reflux for 4 hours
2. filtrationthe solids were filtered
3. washwashed with 3N HCl and diethyl ether, and air
4. customdried