反应详情

To a stirred solution of the compound prepared in Example 448 (48 mg) in tetrahydrofuran (1 mL) at ambient temperature was added zinc dust (120 mg), and to the resulting stirred mixture added saturated ammonium chloride (0.5 mL). The resulting mixture was stirred at ambient temperature for 17 hours. The reaction mixture was diluted with tetrahydrofuran (5 mL) and filtered through a glass microfibre filter. The flask and filter were rinsed with additional tetrahydrofuran. The combined filtrate and rinses were concentrated to remove most of the tetrahydrofuran, and the residue was partitioned between ethyl acetate and water, with addition of 10% sodium carbonate. The organic layer was dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 99/1 chloroform/methanol to provide the title compound (20 mg) with the following physical data. 1H NMR (CDCl3): δ 8.60 (d, J=4.4 Hz, 1H), 8.15 (d, J=8.0 Hz, 1H), 7.79 (m, 2H), 7.68 (s, 1H), 7.32 (m, 2H), 5.77 (broad s, 2H), 4.35 (q, J=7.2 Hz, 2H), 3.80 (broad s, 2H), 3.33 (t, J=6.8 Hz, 2H), 2.99 (d, J=10.8 Hz, 2H), 2.11 (t, J=10.8 Hz, 2H), 1.76 (d, J=12.0 Hz, 2H), 1.60 (broad s, 1H), 1.41 (m, 5H);

1. stirringThe resulting mixture was stirred at ambient temperature for 17 hours
2. filtrationfiltered through a glass microfibre
3. filtrationfilter
4. filtrationThe flask and filter
5. washwere rinsed with additional tetrahydrofuran
6. concentrationThe combined filtrate and rinses were concentrated
7. customto remove most of the tetrahydrofuran
8. customthe residue was partitioned between ethyl acetate and water, with addition of 10% sodium carbonate
9. dry with materialThe organic layer was dried over sodium sulfate
10. concentrationconcentrated
11. customThe residue was purified by chromatography on silica gel
12. washeluting with 99/1 chloroform/methanol