反应详情

温度

60 °C

A solution of a scalemic mixture enriched in (1S,3R,4S)-3-ethyl-4-(6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentyl 4-nitrophenyl carbonate (0.150 g, 0.254 mmol) in 1,4-dioxane (1 mL) was added to a solution of cyclobutanamine (0.090 g, 1.27 mmol) in 1,4-dioxane (0.2 mL). After about 1 h, aqueous NaOH (1 N, 1.5 mL, 1.50 mmol) was added and the reaction mixture was heated at about 60° C. for about 2 h before cooling to rt. The organic solvent was removed under reduced pressure. The resulting aqueous layer mixture was acidified with AcOH to pH about 5 and extracted with DCM (3×5 mL). The combined organic extracts were concentrated under reduced pressure. The residue was purified by preparative HPLC (Table 1 method d) to give (1S,3R,4S)-3-ethyl-4-(6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentyl cyclobutylcarbamate (0.0468 g, 50%): LC/MS (Table 1, Method c) Rt=1.17 min; MS m/z: 369 (M+H)+.

1. temperaturebefore cooling to rt
2. customThe organic solvent was removed under reduced pressure
3. extractionextracted with DCM (3×5 mL)
4. concentrationThe combined organic extracts were concentrated under reduced pressure
5. customThe residue was purified by preparative HPLC (Table 1 method d)