Reaction Steps
Following the procedure as described in EXAMPLE 4 and making non-critical variations using 2-(bromomethyl)-1,3-benzothiazole to replace 2-(bromomethyl)tetrahydro-2H-pyran, and 2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-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, 1′-(1,3-benzothiazol-2-ylmethyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (77%) as a colorless solid: mp 164-166° C.; 1H NMR (300 MHz, CDCl3) δ8.04 (d, J=8.1 Hz, 1H), 7.85 (d, J=8.1 Hz, 1H), 7.54-7.46 (m, 1H), 7.43-7.35 (m, 1H), 7.24-7.17 (m, 2H), 7.05 (dd, J=7.5, 7.5 Hz, 1H), 6.97 (d, J=7.8 Hz, 1H), 6.53 (s, 1H), 6.41 (s, 1H), 5.53 (d, J=16.2 Hz, 1H), 5.24 (d, J=16.2 Hz, 1H), 4.97 (d, J=9.0 Hz, 1H), 4.69 (d, J=9.0 Hz, 1H), 4.24-4.11 (m, 4H); 13C NMR (75 MHz, CDCl3) δ177.2, 165.9, 155.3, 152.9, 144.7, 141.2, 138.3, 135.3, 132.1, 128.9, 126.3, 125.5, 124.0, 123.9, 123.2, 121.9, 120.8, 111.8, 109.2, 99.4, 64.5, 63.9, 58.0, 42.6; MS (ES+) m/z 442.8 (M+1).
