反应详情

Following the procedure as described in EXAMPLE 12 and making non-critical variations using butylamine 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-butyl-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 (77%) as a colorless solid: mp 176-178° C.; 1H NMR (300 MHz, CDCl3) δ7.48-7.41 (m, 1H), 7.37-7.14 (m, 6H), 7.09-6.99 (m, 3H), 6.55-6.37 (m, 3H), 5.25-5.07 (m, 2H), 4.94 (d, J=9.0 Hz, 1H), 4.70 (d, J=9.0 Hz, 1H), 4.52 (t, J=8.2 Hz, 2H), 3.47 (q, J=6.6 Hz, 2H), 2.98 (t, J=8.7 Hz, 2H), 1.67-1.55 (m, 2H), 1.50-1.35 (m, 2H), 0.95 (t, J=6.6 Hz, 1H); MS (ES+) m/z 491.1 (M+23).