Toluene → HCID 25235943, compound

Participants

Reaction Conditions

Reaction Steps

A 20% solution of phosgene in toluene (163 uL, 0.310 mmol) was added dropwise to a solution of piperidine (31 uL, 0.310 mmol) in DCM (2 mL) and EDIPA (108 uL, 0.620 mmol) at 0° C. under N2. The reaction was stirred for 40 min before the addition of 2-(2,6-dichloro-phenyl)-3H-benzoimidazole-5-carboxylic acid hydrazide (50 mg, 0.155 mmol) and DMF (1 mL). The ice in the ice bath was allowed to melt, slowly warming the reaction to room temp. The reaction was stirred for 4 days. The reaction was diluted with EtOAc (60 mL) and extracted with water (10 mL). The organic phase was concentrated to a yellow oil. The yellow oil was added to a microwave vial charged with THF (1.5 mL) and Burgess reagent. The mixture was heated by microwave irradiation to 150° C. for 15 min. The reaction was concentrated, and the concentrate diluted with water. The resulting precipitate was collected by filtration and purified by reverse-phase HPLC (25-60% ACN/H2O+5 mM NH4OH) to afford the title compound: 1H NMR (400 MHz, MeOD) δ ppm 1.74 (br. s., 6H) 3.57-3.64 (m, 4H) 7.55-7.63 (m, 3H) 7.78 (d, J=8.59 Hz, 1H) 7.94 (dd, J=8.53, 1.33 Hz, 1H) 8.20 (br. s., 1H); MS (m/z) 414.1 (M+1).

Provenance & Evidence