2,3-Dichloropyridine → Tert-butyl 4-(3-chloropyridin-2-yl)piperazine-1-carboxylate

Beteiligte Stoffe

Reaktionsschritte

tert-butyl piperazine-1-carboxylate (1.0 g, 5.37 mmol) and 2,3-dichloropyridine (795 mg, 5.37 mmol) charged to a microwave vial was added with diisopropylethylamine (2.34 mL, 13.42 mmol) and DMF (1.0 mL). The reaction mixture was subject to microwave irradiation at 165° C. for 30 minutes. The reaction was repeated six times in order to scale up. Combined reaction mixture was partitioned between EtOAc and water, organic layer washed with brine and dried over MgSO4. The crude product obtained by solvent evaporation was purified via flash column chromatography. tert-butyl 4-(3-chloropyridin-2-yl)piperazine-1-carboxylate was obtained in 20% yield (1.9 g) as yellow oil.

Herkunft & Nachweise