Propargyl alcohol → (S)-ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-((4-(hydroxymethyl)-1H-1,2,3-triazol-1-yl)methyl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate

Participants

Reaction Steps

To a stirred colorless clear solution of (S)-ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-(azidomethyl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate (0.049 g, 0.098 mmol), propargyl alcohol (0.029 ml, 0.490 mmol) and DIEA (0.086 ml, 0.490 mmol) in THF (2 mL) was added CuI (0.037 g, 0.196 mmol) at rt. The resulting turbid yellow reaction mixture stirred for 22 h and diluted with Et2O (50 mL), washed with 1% aq NH4OH (2×10 mL), brine (10 mL), dried (MgSO4), filtered and concentrated to afford (S)-ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-((4-(hydroxymethyl)-1H-1,2,3-triazol-1-yl)methyl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate as pale yellow paste which was used in the next step without purification.

Provenance & Evidence