Dabsyl chloride → 4-(4-Dimethylamino-phenylazo)-n-(3-oxo-2,3-dihydro-7-oxa-1,2-diaza-benzo[de]anthracen-10-ylmethyl)-benzenesulfonamide

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To a solution of compound 49 (0.5 mmol) in anhydrous DMF (20 mL) was added 4-dimethylaminoazobenzene-4′-sulfonyl chloride (0.5 mmol). The mixture was stirred for 3 hours at room temperature. The reaction mixture was concentrated in vacuo, and 50 mL of 50% EtOAc in hexanes was added. The precipitate was formed and collected through filtration. The crude product was recrystallized in 50% ethanol to afford a orange solid 55 in 59% yield. MS (ES+): 553; Mp: >300° C.; 1H-NMR (DMSO-d6, 400 MHz): 12.63 (s, 1H), 7.90 (d, J=2.0 Hz, 1H), 7.86-7.74 (m, 6H), 7.67 (d, J=9.0 Hz, 2H), 7.62 (dd, J=6.6 and 2.5 Hz, 1H), 7.44 (dd, J=8.5 and 2.0 Hz, 1H), 7.30 (d, J=8.5 Hz, 1H), 6.81 (d, J=9.0 Hz, 2H), 4.15 (s, 2H), 3.09 (s, 6H); Anal. Calcd. for C29H24N6O4S.(1.3H2O): C, 60.47; H, 4.65; N, 14.59; S, 5.57. Found: C, 60.72; H, 4.93; N, 15.39; S, 4.93.

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