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 benzyl 3-bromopropyl ether to replace 2-(bromomethyl)-5-(trifluoromethyl)furan, 1′-[3-(benzyloxy)propyl]-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one was obtained (89%) as a colorless solid: mp 112-113° C. (ethyl acetate/hexanes); 1H NMR (300 MHz, CDCl3) δ 7.35-7.27 (m, 6H), 7.14 (d, J=6.0 Hz, 1H), 7.06-6.95 (m, 2H), 6.41-6.39 (m, 2H), 4.63 (AB, 2H), 4.54-4.48 (m, 4H), 3.94-3.80 (m, 2H), 3.54 (t, J=6.0 Hz, 2H), 2.95 (t, J=9.0 Hz, 2H), 2.07-1.99 (m, 2H); MS (ES+) m/z 428.1 (M+1).