Trifluoroacetic acid → 2-(2-((1R,3S,5R)-2-azabicyclo[3.1.0]hexan-3-yl)-1H-benzo[d]imidazol-6-yl)-6-(2-((1R,3S,5R)-2-azabicyclo[3.1.0]hexan-3-yl)-1H-imidazol-5-yl)quinoxaline

Participants

Reaction Steps

TFA (0.25 mL, 3.24 mmol) was added to a solution of (1R,3S,5R)-tert-butyl 3-(5-(2-(2-((1R,3S,5R)-2-(tert-butoxycarbonyl)-2-azabicyclo[3.1.0]hexan-3-yl)-1H-benzo[d]imidazol-6-yl)quinoxalin-6-yl)-1H-imidazol-2-yl)-2-azabicyclo[3.1.0]hexane-2-carboxylate (30 mg, 0.044 mmol) in DCM (0.5 mL) and the mixture was stirred at rt for 16 h. The volatiles were removed under vacuum and the residue was triturated with Et2O to yield a TFA salt of 2-(2-((1R,3S,5R)-2-azabicyclo[3.1.0]hexan-3-yl)-1H-benzo[d]imidazol-6-yl)-6-(2-((1R,3S,5R)-2-azabicyclo[3.1.0]hexan-3-yl)-1H-imidazol-5-yl)quinoxaline (32.7 mg) as yellow solid. LC-MS retention time 1.33 min; m/z 475 [M+H]+. (Column PHENOMENEX® Luna 3.0×50 mm S10. Solvent A=90% water:10% methanol:0.1% TFA. Solvent B=10% water:90% methanol:0.1% TFA. Flow Rate=4 mL/min. Start % B=0. Final % B=100. Gradient Time=3 min. Wavelength=220). 1H NMR (400 MHz, MeOD) δ ppm 9.47 (s, 1H), 8.54 (s, 1H), 8.50 (s, 1H), 8.31 (dd, J=8.8, 1.8 Hz, 1H), 8.26 (dd, J=8.5, 1.3 Hz, 1H), 8.15 (d, J=8.8 Hz, 1H), 7.83 (s, 1H), 7.82 (d, J=8.8 Hz, 1H), 4.85-4.97 (m, 1H), 4.67 (dd, J=10.8, 7.5 Hz, 1H), 3.45-3.57 (m, 2H), 2.77-2.86 (m, 1H), 2.65-2.74 (m, 1H), 2.52-2.65 (m, 2H), 2.02-2.15 (m, 2H), 1.18-1.30 (m, 2H), 0.95-1.09 (m, 2H).

Provenance & Evidence