Dansyl chloride → N-Dansyl-3,5-di-(3-methylmaleimido)aniline

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Dansyl chloride (139 mg, 0.517 mmol) in pyridine (3 mL) was added to a pyridine solution of 4 (200 mg, 0.517 mmol). The resulting mixture was stirred at 25° C. for 18 hours after which the volatiles were evaporated under reduced pressure. The resulting oil was taken back in CHCl3 and the organic phase was washed with aqueous saturated Na2CO3, dried over MgSO4 and evaporated. The crude was purified by flash chromatography on silica gel (Tol/EtOAc 10%) giving 5 as a light green solid (40 mg, 0.074 mmol, 16%). 1H NMR (400 MHz, (CD3)2CO) δ 9.71 (s, 1H), 8.56 (d, J=8.4 Hz, 1H), 8.51 (d, J=8.8 Hz, 1H), 8.39 (dd, J1=1.2, 7.2 Hz, 1H), 7.62-7.58 (td, J=1.2, 7.2 Hz, 2H), 7.28-7.27 (m, 3H), 7.11 (t, J=2.0 Hz, 1H), 6.63-6.61 (m, 2H); 13C NMR (75 MHz, (CD3)2CO) δ 171.3, 170.4, 152.8, 135.4, 134.0, 131.7, 131.5, 130.3, 130.2, 129.6, 128.7, 124.9, 119.8, 119.6, 116.6, 115.9, 46.3, 12.1; HRMS (ESI) Calculated for C28H25N4O6S [M+H]+: 545.1516. Found: 545.1489. m.p.: 230° C.

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