反应详情

Following the procedure as described in EXAMPLE 9 and making non-critical variations using 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one to replace 3-methylspiro[furo[3,2-f][1,2]benzisoxazole-5,3′-indol]-2′(1′H)-one, and methyl 4-(bromomethyl)benzoate to replace 2-(bromomethyl)-5-(trifluoromethyl)furan, methyl 4-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]benzoate was obtained (95%) as a colorless solid: mp 136-140° C.; 1H NMR (300 MHz, CDCl3) δ8.01 (d, J=8.1 Hz, 2H), 7.39 (d, J=8.1 Hz, 2H), 7.17 (d, J=7.4 Hz, 2H), 7.02 (dd, J=7.4, 7.4 Hz, 1H), 6.72 (d, J=7.6 Hz, 1H), 6.48 (s, 1H), 6.44 (s, 1H), 4.99 (ABq, 2H), 4.84 (ABq, 2H), 4.54 (t, J=8.6 Hz, 2H), 3.89 (s, 3H), 3.06-2.92 (m, 2H); MS (ES+) m/z 428.1 (M+1).