Trifluoroacetic acid → HCID 9979273, compound

Participants

Reaction Steps

TFA (0.75 mL) is added to a solution of the carbamate from Step 6 of Example 3 (100 mg, 0.247 mmol) in dichloroethane (3.0 mL). This solution is stirred for 1.5 h., and the solvent is removed under vacuum. The residue is dissolved in MeOH (4.0 mL). TEA (105 mg, 1 mmol) is added to the mixture, followed by adding ethyl dichloroacetate (77 mg, 0.49 mmol). The mixture is stirred at r.t. for 16 h. Solvent is removed under vacuum, and the crude product purified by silica gel column chromatography (gradient 1% to 2% MeOH in DCM). MS (m/z): 417 [M+1]+. 1H NMR (300 MHz, DMSO-d6) δ 9.17 (t, J=5.5 Hz, 1H), 7.79 (d, J=14.3 Hz, 1H), 7.69–7.48 (m, 3 H), 6.67 (s, 1H), 5.17 (d, J=7.7 Hz, 1H), 5.05–4.99 (m, 1H), 4.35 (t, J=9.1 Hz, 1H), 4.06 (t, J=7.7 Hz, 3H), 3.93 (dd, J=6.0 and 9.3 Hz, 1H), 3.74–3.72 (m, 2H), 3.51–3.49 (m, 2H).

Provenance & Evidence