反应详情

Following the procedure as described in EXAMPLE 12 and making non-critical variations using 2-ethyl-n-butylamine to replace cyclohexanemethylamine, and 4-[(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-(2-ethylbutyl)-4-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]benzamide was obtained (60%) as a colorless solid: mp 211-213° C.; 1H NMR (300 MHz, CDCl3) δ7.78-7.70 (m, 2H), 7.44-7.37 (m, 2H), 7.24-7.15 (m, 2H), 7.08-7.00 (m, 1H), 6.77-6.71 (m, 1H), 6.47 (s, 1H), 6.44 (s, 1H), 6.08-5.99 (m, 1H), 4.99 (ABq, 2H), 4.85 (ABq, 2H), 4.59-4.50 (m, 2H), 3.44-3.36 (m, 2H), 3.10-2.91 (m, 2H), 1.55-1.30 (m, 5H), 0.97-0.87 (m, 6H); MS (ES+) m/z 497.0 (M+1).