Lithium Hexamethyldisilazide → HCID 57489620, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 2,6-dichloronicotinamide (3 g, 15.71 mmol) and benzyl 4-(4-aminophenyl)piperazine-1-carboxylate (5.38 g, 17.28 mmol) in THF (100 mL) was added lithium bis(trimethylsilyl)amide (55.0 mL, 55.0 mmol) at −78° C. The reaction mixture was stirred at −78° C. for 20 min. and at rt for 2 h. The reaction was quenched with water and extracted three times with ethyl acetate. The combined organic layers were washed with water and concentrated. The residue was purified by MPLC chromatography (ISCO, 6% NH4OH/MeOH/CH2Cl2, 40 g+12 g stacked column) to give 6.8 g of benzyl 4-(4-(3-carbamoyl-6-chloropyridin-2-ylamino)phenyl)piperazine-1-carboxylate as a brown solid. LCMS: (M+H)+=466.2, 468.2 (Cl pattern).

Provenance & Evidence