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

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A solution of 1-(6-(4-amino-2,2-dioxo-1H-benzo[c][1,2,6]thiadiazin-5-yloxy)hexyl)-3-(4-methoxybenzyl)urea (122 mmol, 58 mg) (Example 279) in DCM (2.5 mL) was treated with TFA (2.5 mL). The reaction mixture was stirred at room temperature for 4 hours, then the volatiles were removed under a stream of nitrogen. The oily residue was triturated with ether, the precipitate collected, washed with ether, then dissolved in MeOH and evaporated to gives the desired product (44 mg, 100% yield). 1H NMR (400 MHz, DMSO-d6) δ 1.364 (m, 6H), 1.812 (pentet, J=7 Hz, 2H), 2.943 (br t, 2H), 4.154 (d, J=7 Hz, 2H), 4.131 (t, J=7 Hz, 2H), 5.349 (br. s, 2H), 5.894 (br. s, 1H), 6.607 (d, J=8 Hz, 1H), 6.752 (d, J=8 Hz, 1H), 7.456 (t, J=8 Hz, 1H), 7.824 (br. s, 1H), 8.351 (br. s, 1H), 10.945 (s, 1H). MS 356 (MH+).

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