Phosphorus oxychloride → 1-Azabicyclo[2.2.2]oct-4-ylmethyl (2-cyano-5-phenyl-1,3-thiazol-4-yl)carbamate hydrochloride

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Reaction Steps

To a solution of 1-azabicyclo[2.2.2]oct-4-ylmethyl (2-carbamoyl-5-phenyl-1,3 thiazol-4-yl)carbamate (100 mg) in DMF (5 mL) was added phosphorous oxychloride (48 μL) at 0° C., followed by stirring for 1 hour. To the reaction mixture was added EtOAc, followed by dilution, addition of an aqueous NaHCO3 solution, and extraction with EtOAc. The organic layer was washed with water and brine in this order, then dried, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (CHCl3:MeOH:28% aqueous ammonia=9:1:0.1), and the brown oily substance obtained was dissolved in EtOAc, followed by addition of 4 M HCl/EtOAc and stirring. The mixture was concentrated under reduced pressure, EtOAc was added thereto, and the solid precipitated was collected by filtration to obtain 1-azabicyclo[2.2.2]oct-4-ylmethyl (2-cyano-5-phenyl-1,3-thiazol-4-yl)carbamate hydrochloride (33 mg) as a pale brown solid.

Provenance & Evidence