Triethylamine → 1-(6-(4-amino-2,2-dioxo-1H-benzo[c][1,2,6]thiadiazin-5-yloxy)hexyl)-3-(4-methoxybenzyl)urea

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To a suspension of 6-(4-amino-2,2-dioxo-1H-benzo[c][1,2,6]thiadiazin-5-yloxy)hexan-1-aminium chloride (166 mmol, 52 mg) (Example 280) in dry DCM (6 mL) was successively added Et3N (332 mmol, 46 μL) and 1-(isocyanatomethyl)-4-methoxybenzene (183 mmol, 26 μL). The reaction was stirred for 48 hours at room temperature then concentrated in vacuo. The residue was washed with water, dried, then purified on silica gel (20% to 100% EtOAc in hexanes) to give the desired product (64 mg, 81.0% yield). 1H NMR (400 MHz, DMSO-d6) δ 1.296 (m, 2H), 1.371 (m, 4H), 1.791 (pentet, J=8 Hz, 2H), 2.980 (q, J=6 Hz, 2H), 3.695 (s, 3H), 4.086 (d, J=6 Hz, 2H), 4.131 (t, J=6 Hz, 2H), 5.836 (br. t, J=5 Hz, 1H), 6.141 (br. t, J=6 Hz, 1H), 6.585 (d, J=8 Hz, 1H), 6.727 (d, J=8 Hz, 1H), 6.840 (d, J=9 Hz, 2H), 7.137 (d, J=9 Hz, 2H), 7.433 (t, J=8 Hz, 1H), 7.803 (br. s, 1H), 8.321 (br. s, 1H), 10.926 (s, 1H). MS 476 (MH+).

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