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