ethyl 7-(4-(((R)-5-(benzyloxy)hexyl)oxy)-4-methylpiperidin-1-yl)-6-((S)-1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate → ethyl 6-((S)-1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-7-(4-(((R)-5-hydroxyhexyl)oxy)-4-methylpiperidin-1-yl)-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate

Participants

Reaction Steps

To a solution of ethyl 7-(4-(((R)-5-(benzyloxy)hexyl)oxy)-4-methylpiperidin-1-yl)-6-((S)-1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate (1.7 g, 2.55 mmol) in EtOH (25 mL) was added 10% Pd/C (0.271 g, 0.255 mmol) and the resulting mixture was stirred under balloon hydrogen atmosphere for 5 h. Mixture was then filtered and concentrated to afford ethyl 6-((S)-1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-7-(4-(((R)-5-hydroxyhexyl)oxy)-4-methylpiperidin-1-yl)-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate (1.2 g, 2.081 mmol, 82% yield) as viscous oil. LCMS (M+H)=577.3. Used as is in the next step without further purification.

Provenance & Evidence