Dimethylformamide → 3-(4-Methyl-1H-imidazol-1-yl)-N-[4-methyl-3-(9H-pyrimido[4,5-b]indol-7-yl)phenyl]-5-(trifluoromethyl)benzamide bis(trifluoroacetate)

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Reaction Steps

To 3-(4-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)benzoic acid (39 mg, 0.14 mmol, prepared according to WO2004005281) was added DMF (0.93 mL) followed by N,N,N′,N′-tetramethyl-O-(7-azabenzotriazol-1-yl)uronium hexafluorophosphate (66.5 mg, 0.175 mmol) and N,N-diisopropylethylamine (DIPEA) (30.5 μL, 0.175 mmol). This solution was stirred at ambient temperature for 15 minutes, then 4-methyl-3-(9H-pyrimido[4,5-b]indol-7-yl)aniline (40.0 mg, 0.146 mmol) was added. The reaction was held at ambient temperature until LCMS indicated complete reaction, typically 1-2 hours. The reaction was partitioned between water and EtOAc and the organic phase was washed with water and saturated aqueous NaCl, then dried (MgSO4) and evaporated to dryness to leave the crude product. This was purified by preparative LCMS to recover the product as a bis-TFA salt (60.3 mg, 55%). 1H NMR (400 MHz, DMSO): δ 13.0 (bs, 1H), 10.67 (s, 1H), 9.63 (s, 1H), 9.60 (s, 1H), 9.12 (s, 1H), 8.60 (s, 1H), 8.42 (m, 2H), 8.37 (d, 1H), 8.15 (s, 1H), 7.77 (m, 2H), 7.56 (s, 1H), 7.43 (dd, 1H), 7.37 (d, 1H), 2.33 (s, 3H), 2.26 (s, 3H). MS (EI) m/z=527 (M+H).

Provenance & Evidence