2,2,2-Trifluoroethyl trifluoromethanesulfonate → 1-N-[7-thia-9,11-diazatricyclo[6.4.0.0^[2,6]]dodeca-1(8),2(6),9,11-tetraen-12-yl]-4-N-(2,2,2-trifluoroethyl)cyclohexane-1,4-diamine

Participants

Reaction Conditions

Reaction Steps

To a 50 mL round-bottom flask containing a solution of 1-N-[7-thia-9,11-diazatricyclo[6.4.0.0^[2,6]]dodeca-1(8),2(6),9,11-tetraen-12-yl]cyclohexane-1,4-diamine (288 mg, 1.00 mmol, 1.00 equiv) in DMF (10 mL) was added F3CSO3CH2CF3 (700 mg, 3.02 mmol, 3.00 equiv) and DBU (457 mg, 3.01 mmol, 3.00 equiv) in ice-water bath under nitrogen. The resulting solution was stirred overnight at 60° C. After completion of the reaction, the reaction solution was cooled down to room temperature and then quenched with water, diluted with DCM (30 mL), washed with brine, dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with DCM/methanol (30:1 to 20:1) to provide the desired 1-N-[7-thia-9,11-diazatricyclo[6.4.0.0^[2,6]]dodeca-1(8),2(6),9,11-tetraen-12-yl]-4-N-(2,2,2-trifluoroethyl)cyclohexane-1,4-diamine (300 mg, 81%) as a white solid. MS (electrospray) m/z 371 (M+H)+; 1H NMR (400 MHz, CD3OD): 8.22 (s, 1H), 4.06-4.14 (m, 1H), 3.24-3.32 (q, 2H), 3.01 (t, 2H), 3.07 (t, 2H), 2.51-2.78 (m, 3H), 2.04-2.15 (m, 4H), 1.43-1.55 (m, 2H), 1.28-1.35 (m, 2H).

Provenance & Evidence