反应详情

A 100 mL one neck round bottomed flask equipped with reflux condenser, nitrogen inlet and provisions for magnetic stirring was charged with 3,4-dihydro-2-[2,2,2-trifluoro-1-hydroxyethylidene]-1(2H)-naphthalenone from Step 1 (1.21 g, 5.0 mmol), 4-sulfonamidophenylhydrazine hydrochloride (1.12 g, 5.0 mmol) and 25 mL of absolute ethanol. The solution was warmed to reflux for 15 hours, cooled and concentrated in vacuo. The residue was dissolved in ethyl acetate, washed with water and with brine, dried over anhydrous MgSO4, filtered and reconcentrated in vacuo. The residue was recrystallized from a mixture of ethyl acetate and isooctane to give 1.4 g (71%) of pure 4,5-dihydro-4-[3-(trifluoromethyl)-1H-benz[g]indazol-1-yl]benzenesulfonamide: mp 257°-258° C.; 1H NMR (CDCl3 /CD3OD, 4:1) δ 2.7 (m, 2H), 2.9 (m, 2H), 6.6 (m, 1H), 6.9 (m, 1H), 7.1 (m, 1H), 7.16 (m, 1H), 7.53 (m, 2H), 7.92 (m, 2H); 19F NMR CDCl3 δ-62.5. FAB-MS M+H=394.

1. temperaturewith reflux condenser, nitrogen inlet
2. temperatureThe solution was warmed
3. temperatureto reflux for 15 hours
4. temperaturecooled
5. concentrationconcentrated in vacuo
6. dissolutionThe residue was dissolved in ethyl acetate
7. washwashed with water and with brine
8. dry with materialdried over anhydrous MgSO4
9. filtrationfiltered
10. customThe residue was recrystallized from a mixture of ethyl acetate and isooctane