Cesium carbonate → 1-(4-Methoxy-benzyl)-2,2-dimethyl-4-(5-nitro-pyridin-2-ylmethyl)-piperazine

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Reaction Steps

A mixture of methanesulfonic acid 5-nitro-pyridin-2-ylmethyl ester (Step 112.3) (0.5 g, 2.16 mmol), 1-(4-methoxy-benzyl)-2,2-dimethyl-piperazine (Step 108.2) (0.655 g, 2.8 mmol, 1.3 equiv), cesium carbonate (0.845 g, 2.6 mmol, 1.2 equiv), and DMF (4 ml) was stirred for 5 h at rt, quenched by addition of a saturated aqueous solution of NaHCO3 and extracted with EtOAc. The organic phase was washed with a saturated aqueous solution of NaHCO3, dried (Na2SO4), filtered and concentrated. The residue was purified by by silica gel column chromatography (DCM DCM/MeOH, 99:1) to provide 0.642 g of the title compound as a red solid: ESI-MS: 371.2 [M+H]+; tR=3.18 min (System 1); TLC: Rf=0.44 (DCM/MeOH, 9:1).

Provenance & Evidence