反应详情

To a solution of the compound (1.35 g) obtained in Step 3 in 1,4-dioxane (68 ml)/N,N-dimethylformamide (13 ml) was added manganese dioxide (3.68 g) at room temperature and the mixture was stirred at room temperature for 40 hr. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure to give the title compound (1.20 g).

1. filtrationThe insoluble material was filtered off
2. concentrationthe filtrate was concentrated under reduced pressure