[O:1]1[C:5]([C:6]2[C:14]3[C:9](=[CH:10][CH:11]=[C:12]([C:15]#[N:16])[CH:13]=3)[NH:8][N:7]=2)=[CH:4][C:3]2[CH:17]=[CH:18][CH:19]=[CH:20][C:2]1=2.C([Sn]([N:34]=[N+:35]=[N-:36])(CCCC)CCCC)CCC.O1CCOCC1.Cl>C1(C)C=CC=CC=1>[N:16]1[NH:34][N:35]=[N:36][C:15]=1[C:12]1[CH:13]=[C:14]2[C:9](=[CH:10][CH:11]=1)[NH:8][N:7]=[C:6]2[C:5]1[O:1][C:2]2[CH:20]=[CH:19][CH:18]=[CH:17][C:3]=2[CH:4]=1
To a solution of 3-benzo[b]furan-2-yl-1H-indazole-5-carbonitrile (185 mg, 0.713 mmol) in toluene (10 mL) was added tributyl tin azide (0.780 mL). The solution was brought to 110° C. for 18 hours. The solution was cooled and toluene condensed to give an oil. Dioxane (3 mL) and 6 N HCl (3 mL) was added and the solution stirred for 3 hours at ambient temperature. The resulting precipitate was basified using 6 N HCl. The basic aqueous layer was washed with hexanes and ethyl acetate. The aqueous hydroxide solution was filtered through celite and acidified with 6 N HCl to pH 4. The resulting precipitate was filtered and dried to afford the title compound (25 mg, 12% yield). 1H NMR (DMSO-d6) δ 13.88 (s, 1H), 8.90 (s, 1H), 8.10 (d, 1H), 7.83 (d, 1H), 7.73 (d, 2H), 7.54 (s, 1H), 7.34 (m, 2H); ES-MS (m/z) 303 [M+1]+.
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