4-Fluoroaniline → 6-oxo-3,4,5,6-tetrahydro-1H-azepino[5,4,3-cd]indole-2-carboxylic acid (4-fluoro-phenyl)-amide

Participants

Reaction Steps

6-Oxo-3,4,5,6-tetrahydro-1H-azepino[5,4,3-cd]indole-2-carboxylic acid (100 mg, 0.43 mmol), 4-fluoroaniline (48 mg, 0.43 mmol), and diisoprophylethylamine (168 mg, 1.30 mmol) were dissolved in 5 mL dry DMF. HATU (173 mg, 0.46 mmol) was added and the resulting mixture stirred at room temperature under argon for 3 d. The reaction mixture was partitioned between water and 25% iPrOH/CHCl3. The layers were separated, and the aqueous layer extracted thrice with 25% iPrOH/CHCl3. The combined organic layers were dried (MgSO4) and concentrated in vacuo leaving an off-white solid which was recrystallized from chloroform/methanol to yield 6-oxo-3,4,5,6-tetrahydro-1H-azepino[5,4,3-cd]indole-2-carboxylic acid (4-fluoro-phenyl)-amide, 70 mg (50%) as a pale yellow solid: m.p. 330-332° C. (dec); 1H NMR (300 MHz, d6-DMSO) δ 3.28 (m, 2H), 3.42 (m, 2H), 7.22 (m, 2H), 7.35 (app t, J=7.8 Hz, 1H), 7.65 (dd, J=7.8, 0.6 Hz, 1H), 7.77 (m, 3H), 8.16 (br t, 1H), 10.08 (br s, 1H), 11.81 (br s, 1H). MS (electrospray, MH+) 324. Anal. (C18H14FN3O2.0.4 H2O) C, H, N.

Provenance & Evidence