反应详情

Following the procedure as described in EXAMPLE 4 and making non-critical variations using 6,7-dihydrospiro[benzo[1,2-b:4,5-b′]difuran-3,3′-indol]-2′(1′H)-one to replace 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2″(1′H)-one, and 2-(bromomethyl)pyridine hydrobromide to replace 2-(bromomethyl)tetrahydro-2H-pyran, 1′-(pyridin-2-ylmethyl)-6,7-dihydrospiro[benzo[1,2-b:4,5-b′]difuran-3,3′-indol]-2′(1′H)-one was obtained (67%) as a colorless solid: mp 198-200° C. (diethyl ether/hexanes); 1H NMR (300 MHz, CDCl3) δ8.59 (d, J=4.8 Hz, 1H), 7.71 (dd, J=7.8, 7.5 Hz, 1H), 7.32-7.15 (m, 4H), 7.02 (dd, J=7.5, 7.5 Hz, 1H), 6.94 (d, J=7.8 Hz, 1H), 6.82 (s, 1H), 6.17 (s, 1H), 5.27 (d, J=15.6 Hz, 1H), 5.01 (d, J=15.6 Hz, 1H), 4.98 (d, J=9.0 Hz, 1H), 4.70 (d, J=9.0 Hz, 1H), 4.49 (td, J=8.7, 0.7 Hz, 2H), 3.15 (t, J=8.7 Hz, 2H); 13C NMR (75 MHz, CDCl3) δ177.7, 155.3, 155.2, 154.9, 148.6, 142.1, 138.3, 132.1, 129.1, 128.9, 127.6, 124.0, 123.7, 123.3, 122.3, 109.7, 107.2, 104.0, 80.1, 71.8, 58.6, 45.5, 30.4; MS (ES+) m/z 370.9 (M+1).