Triethylamine → HCID 25115011, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of the title compound from Example 1 (100 mg, 0.25 mmol) in tert-butanol (2.4 mL) were added diphenylphosphoryl azide (DPPA) (0.07 mL, 0.32 mmol) and triethylamine (0.045 mL, 0.32 mmol). The mixture was heated at 100° C. for 75 minutes. The solvent was evaporated and the mixture redissolved in HCl (4M in dioxane, 2 mL) and stirred at room temperature for 2.5 hours. Subsequently, 4% aqueous sodium bicarbonate (40 mL) was added to the mixture and the reaction was extracted with ethyl acetate (3×25 mL). The combined organic layers were washed with brine, dried over anhydrous sodium sulphate and the solvent was removed under reduced pressure to give 106 mg of a yellowish oil. The mixture was purified by column chromatography (C-18 silica from Waters©, reverse phase water/(acetonitrile/methanol 50:50) as eluent [0.1% v/v ammonium formate buffered] 0% to 100%). The organic solvent from the appropriate fractions was evaporated and the aqueous phase basified to pH 10 with ammonium hydroxide. This was extracted with ethyl acetate, dried over sodium sulphate and the solvent removed under reduced pressure to give the title compound as a white solid (55 mg, 60%).

Provenance & Evidence