反应详情

To a stirred solution of (2S)-ethyl 2-(2-((4-(1-(allyloxy)-3-methylbutyl)-1H-1,2,3-triazol-1-yl)methyl)-7-(4-(allyloxy)-4-methylpiperidin-1-yl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate (0.080 g, 0.123 mmol) in 1,2-dichloroethane (30 mL) was added Hoveyda-Grubbs catalyst 2nd generation (3.85 mg, 6.14 μmol) at 70° C. After 2 h at 75° C., the reaction mixture was filtered through a plug of silica gel (washed with 10 mL of EtOAC), concentrated and used in the next step without purification. A solution of above crude ester and NaOH (0.491 ml, 0.491 mmol) in MeOH (4 mL) was refluxed for 2 h. Then, cooled and purified by prep-HPLC to afford mixture of diastereomers (0.087 g, 0.146 mmol, 119% yield) as white solid. LCMS (M+H)=596.7.

1. filtrationthe reaction mixture was filtered through a plug of silica gel (washed with 10 mL of EtOAC)
2. concentrationconcentrated
3. customused in the next step without purification
4. temperatureThen, cooled
5. custompurified by prep-HPLC
6. customto afford
7. additionmixture of diastereomers (0.087 g, 0.146 mmol, 119% yield) as white solid