反应详情

To a solution of the title compound of Example 20 (100 mg, 0.25 mmol) in methanol (5 ml) was added a solution of sodium methoxide in methanol (25-30%, 0.5 ml). After stirring for 72 hours, the mixture was concentrated under reduced pressure. The residue was stirred with water (20 ml). The solid was collected by filtration, washed with hexane (5 ml), and dried under reduced pressure to provide the title compound (60 mg, 59% yield). 1H NMR (DMSO-d6) 10.40 (s, 1H), 7.90 (s, 1H), 7.75 (m, 2H), 7.48-7.55 (m, 3H), 7.38 (m, 1H), 3.98 (s, 3H), 2.54 (s, 3H).

1. concentrationthe mixture was concentrated under reduced pressure
2. stirringThe residue was stirred with water (20 ml)
3. filtrationThe solid was collected by filtration
4. washwashed with hexane (5 ml)
5. customdried under reduced pressure