2-Chloro-5-nitropyridine → tert-Butyl 4-(5-nitropyridin-2-yl)piperazine-1-carboxylate

Participants

Reaction Steps

A solution of 2-chloro-5-nitropyridine (1.58 g, 10.0 mmol) in DMF (15 mL) was treated with 1-Boc-piperazine (1.96 g, 10.5 mmol) in the presence of DBU (3 mL) and Bu4NI (0.185 g, 0.5 mmol) at 80° C. for 18 h. The reaction mixture was diluted with ethyl acetate at 25° C. The organic phase was washed with H2O, saturated NaCl, dried over MgSO4 and then concentrated in vacuo to afford 4(5-nitropyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester as a yellow solid which was used for next step reaction without further purification. MS (ES+) m/z 309.4 (M+1).

Provenance & Evidence