Potassium Carbonate → HCID 67267943, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 3.00 g ethyl 5-amino-2-(3-tert-butoxycarbonylamino-piperidin-1-yl)-3-(but-2-ynyl)-3H-imidazole-4-carboxylate in 36 ml 2 M hydrochloric acid is cooled to 0° C. To this is added a solution of 0.60 g sodium nitrite in 2 ml of water and the reaction mixture is stirred for 1 h at 0° C. Then 8.4 ml hypophosphorous acid are added and the mixture is stirred for a further 14 h at 0° C. Then the reaction mixture is added to ice-cooled aqueous potassium carbonate solution and extracted with dichloromethane. The organic extracts are dried over sodium sulphate and evaporated down. The residue is dissolved in 8 ml dichloromethane, and 1.62 g di-tert-butyl carbonate are added. The solution is stirred for 2 h at ambient temperature, then evaporated to dryness and chromatographed on silica gel (cyclohexane/ethyl acetate 7:3->1:1).

Provenance & Evidence