反应详情

3-Methylthio-2-oxo-2,3-dihydro-1H-indole-5-carboxylic acid isobutyl ester was prepared in 59% yield from isobutyl 4-aminobenzoate according to Procedure D: 1H NMR (DMSO-d6): δ 0.93 (d, J=6.6 Hz, 6H), 1.93 (s, 3H), 1.98 (septet, J=6.6 Hz, 1H), 4.02 (m, 2H), 4.62 (s, 1H), 6.92 (d, J=8.2 Hz, 1H), 7.79 (s, J=1H), 7.86 (d, J=8.2 Hz, 1H), 10.91 (s, 1H); ESI−MS m/z 302 (M+23)−. Zinc reduction of 3-methylthio-2-oxo-2,3-dihydro-1H-indole-5-carboxylic acid isobutyl ester according to Procedure δ provided 2-oxo-2,3-dihydro-1H-indole-5-carboxylic acid isobutyl ester in 99% yield: 1H NMR (DMSO-d6): δ 0.93 (d, J=6.6 Hz, 6H), 1.97 (septet, J=6.6 Hz, 1H), 3.53 (s, 2H), 3.99 (d, J=6.6 Hz, 2H), 6.88 (d, J×8.2 Hz, 1H), 7.75 (s, J=1H), 7.82 (d, J=8.2 Hz, 1H), 10.72 (s, 1H); ESI−MS m/z 256 (M+23)+. Conversion of 2-oxo-2,3-dihydro-1H-indole-5-carboxylic acid isobutyl ester to 3-[(dimethylamino)methylene]-2-oxo-2,3-dihydro-1H-indole-5-carboxylic acid isobutyl ester (mixture of E and Z isomers) was accomplished in 75% yield according to Procedure G: 1H NMR (DMSO-d6): δ 0.94 Z (d, J=8.8 Hz, 6H), 0.94 E (d, J=8.8 Hz, 6H), 1.94-2.01 Z and E (m, 2H), 3.30 Z (s, 6H), 3.32 E (s, 6H), 3.97-3.99 Z and E (m, 4H), 6.75 Z (d, J=8.2 Hz, 1H), 6.83 E (d, J=8.2 Hz, 1H), 7.47 E (s, 1H), 7.53 Z (d, J=.8.2 Hz, 1H), 7.59 E (d, J=8.2 Hz, 1H), 7.73 Z (s, 1H), 7.88 Z (s, 1H), 7.98 E (s, 1H), 10.34 Z (bs, 1H), 10.44 E (bs, 1H); ESI−MS m/z 289 (M+1)+. The title compound was prepared in 66% yield from 3-[(1(dimethylamino)methylene]-2-oxo-2,3-dihydro-1H-indole-5-carboxylic acid isobutyl ester and 4-aminobenzenesulfonamide hydrochloride according to Procedure J: 1H NMR (DMSO-d6): δ 0.96 (d, J=6.6 Hz, 6H), 2.01 (septet, J=6.6 Hz, 1H), 4.04 (d, J=6.6 Hz, 2H), 6.93 (d, J=8.2 Hz, 1H), 7.26 (s, 2H), 7.60 (d, J=8.7 Hz, 2H), 7.71 (dd, J=1.6, 8.2 Hz, 1H), 7.76 (d, J=8.7 Hz, 2H), 8.27 (s, 1H), 8.86 (d, J=12.5 Hz, 1H), 10.83 (d, J=12.5 Hz, 1H), 10.95 (s, 1H); APCI−MS m/z 414 (M−H)−. Anal. Calcd for C20H21N3O5S: C, 57.82, H, 5.09; N, 10.11; S, 7.72. Found C, 57.91, H, 5.16; N, 10.02; S. 7.65.