Bms-488043 → Alfa-oxo-1H-pyrrolo-[2,3B]pyridine-3-acetic acid monopotassium salt

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Compound IVa, N-(benzoyl)-N′-[(4,7-dimethoxy-6-azaindol-3-yl)-oxoacetyl]piperazine, was prepared by the same method used to prepare compound 5a but the starting material was Potassium (4,7-dimethoxy-6-azaindol-3-yl)-oxoacetate. The compound was purified by silica gel chromatography using EtOAc as the eluting solvent to give a white solid. 1H NMR (500 MHz, DMSO-d6) δ 13.0 (s, 1H), 8.15 (s, 1H), 7.40 (m, 6H), 4.00 (s, 3H), 3.83 (s, 3H), 3.63-3.34 (m, 8H); 13C NMR (125 MHz, DMSO-d6) δ 185.5, 169.3, 166.5, 146.2, 145.7, 136.6, 135.3, 129.6, 128.4, 126.9, 122.2, 122.1, 119.2, 114.4, 56.8, 52.9, 45.5, 39.9. MS m/z: (M+H)+ calcd for C22H23N4O5: 423.17; found 423.19. HPLC retention time: 1.33 minutes (column B). Anal. Calcd. For C22H21N4O5: C, 62.7; H, 5.02; N, 13.29. Found. C, 61.92; H, 5.41; 13.01. Melting Point: 229.5-232° C.

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