Trifluoroacetic acid → HCID 178482098, compound

Participants

Reaction Steps

A solution of compound 99 (0.35 g, 0.776 mmol) was treated with 20% TFA in CH2Cl2 (20 mL) at 0° C. and stirring was continued for 1 h at the same temperature. The solvent was evaporated and crude was diluted with 10% aq. NH3 (15 mL) and product was extracted into CH2Cl2 (3×20 mL). The combined CH2Cl2 layer was washed with brine (10 mL) and dried (Na2SO4). The solvent was evaporated and the crude product was purified by column chromatography (2 M NH3 in methanol: CH2Cl2, 1:9) to obtain compound 100 (0.2 g, 74%) as a solid. mp 167-169° C.; 1H NMR (DMSO-d6) δ: 1.39-1.47 (m, 2H), 1.88-1.96 (m, 3H), 2.33 (s, 3H), 2.40-2.46 (m, 1H), 2.57-2.61 (m, 1H), 6.01 (s, 1H), 6.19 (brs, 2H), 6.65 (dd, 1H, J=1.5, 8.2 Hz), 7.09 (dd, 1H, J=4.2, 4.9 Hz), 7.20 (s, 1H), 7.28-7.31 (m, 2H), 7.59 (d, 1H, J=4.2 Hz), 7.71 (d, 1H, J=3.3 Hz), 10.87 (s, 1H); ESI-MS m/z (%): 351 (MH+, 66), 320 (54), 160 (63), 119 (100); ESI-HRMS calculated for C20H23N4S (MH+), Calculated: 351.1654; Observed: 351.1637.

Provenance & Evidence