Potassium Carbonate → 4-(6-Methoxy-3-nitro-pyridin-2-ylamino)-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-amino-1-Boc-piperidine (commercial; 6.7 g, 35 mmol), 2-chloro-6-methoxy-3-nitro-pyridine (1 eq.) and K2CO3 (1 eq.) in MeCN (100 mL) and DMF (30 mL) was heated at 60° C. for 3 h. The mixture was filtered and concentrated in vacuo. The residue was taken up in ether/water 1:1, the org. phase dried over MgSO4 and concentrated. The residue was triturated with EA and filtered to afford 4.5 g of pure product. The filtrate was concentrated and purified by CC (Hept/EA 9:1, 4:1, 2:1) to give another 4 g of product. In total 8.5 g (70% yield) of a yellow solid were obtained.

Provenance & Evidence