Cesium carbonate → HCID 90410005, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of Example A1 (0.5 g, 1.987 mmol), 4-benzylpiperazine-1-carboxamide (0.741 g, 3.38 mmol), cesium carbonate (0.971 g, 2.98 mmol) and X-Phos (0.047 g, 0.099 mmol) in dioxane (20 mL) was purged 5 min with Ar. To the reaction mixture was added Pd2 dba3 (0.055 g, 0.060 mmol) and it was then heated to 120° C. After 16 h, the reaction was cooled to RT, diluted with EtOAc (100 mL) and filtered through diatomaceous earth. The filter cake was washed with additional EtOAc and the combined filtrates concentrated to afford crude product. This was purified by silica gel chromatography (0-8% MeOH/DCM) to afford 4-benzyl-N-(4-((6-nitropyridin-3-yl)oxy)pyridin-2-yl)piperazine-1-carboxamide (0.574 g, 66%). 1H NMR (400 MHz, DMSO-d6): δ 9.41 (s, 1H), 8.56 (d, J=2.8 Hz, 1H), 8.40 (d, J=8.9 Hz, 1H), 8.23 (d, J=5.7 Hz, 1H), 7.94 (dd, J=8.9, 2.8 Hz, 1H), 7.55 (d, J=2.3 Hz, 1H), 7.30-7.29 (m, 5H), 6.79 (dd, J=5.7, 2.4 Hz, 1H), 3.47 (s, 2H), 3.43 (t, J=4.7 Hz, 4H), 2.32 (t, J=4.7 Hz, 4H); MS (ESI) m/z: 435.2 (M+H+).

Provenance & Evidence