Reaction Steps
Following the procedure as described in EXAMPLE 12 and making non-critical variations using 3-chloroaniline to replace cyclohexanemethylamine, and 2-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]benzoic acid to replace 3-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]benzoic acid, N-(3-chlorophenyl)-2-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]benzamide was obtained (81%) as a colorless solid: mp>230° C.; 1H NMR (300 MHz, DMSO-d6) δ10.71 (s, 1H), 7.96-7.90 (m, 1H), 7.65-7.57 (m, 2H), 7.52-7.31 (m, 3H), 7.26-7.10 (m, 4H), 6.99 (dd, J=7.4, 7.4 Hz, 1H), 6.87 (d, J=7.8 Hz, 1H), 6.50 (s, 1H), 6.38 (s, 1H), 5.16-4.99 (m, 2H), 4.82 (d, J=9.4 Hz, 1H), 4.67 (d, J=9.4 Hz, 1H), 4.46 (t, J=8.8 Hz, 2H), 3.01-2.83 (m, 2H); 13C NMR (75 MHz, DMSO-d6) δ177.8, 167.8, 161.6, 161.2, 142.8, 140.9, 136.1, 134.5, 133.5, 132.7, 131.1, 130.8, 129.1, 128.5, 127.9, 127.4, 124.1, 123.9, 123.6, 120.9, 120.3, 119.8, 119.6, 118.7, 109.8, 92.9, 80.4, 72.6, 57.4, 41.7, 28.8; MS (ES+) m/z 523.1 (M+1).
