Isatin → 1-(4-fluorophenyl)-3-hydroxy-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-1,3-dihydro-2H-indol-2-one

Participants

Reaction Steps

Following the procedure as described in PREPARATION 1A and making non-critical variations using 2,3-dihydrobenzo[b][1,4]dioxin-6-ol to replace 2-methylbenzo[d]thiazol-5-ol, and 1-(4-fluorophenyl)indoline-2,3-dione (Coppola, G. M Journal of Heterocyclic Chemistry 1987, (24):1249) to replace isatin, 1-(4-fluorophenyl)-3-hydroxy-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-1,3-dihydro-2H-indol-2-one was obtained (23%) as a beige solid: mp 195-200° C.; 1H NMR (300 MHz, DMSO-d6) δ 7.12 (s, 1H), 7.47-7.41 (m, 4H), 7.26 (s, 1H), 7.21-7.16 (m, 1H), 7.01-6.93 (m, 2H), 6.68 (d, J=7.8 Hz, 1H), 6.63 (s, 1H), 6.14 (s, 1H), 4.23-4.14 (m, 4H); 13C NMR (75 MHz, DMSO-d6) δ 176.3, 160.9 (d, 1JC-F=245 Hz), 147.1, 143.9, 142.6, 135.6, 132.0, 131.2 (d, 4JC-F=2.9 Hz), 128.6 (d, 3JC-F=8 Hz), 124.0, 122.4, 121.2, 116.4 (d, 2JC-F=22.8 Hz), 115.1, 108.2, 103.4, 74.4, 64.3, 63.7, 57.2; MS (ES+) m/z 390.0 (M+1).

Provenance & Evidence