[2-(5-Acetyl-3-phenoxymethyl-pyrazol-1-yl)-ethyl]-carbamic acid tert-butyl ester → 4-Methyl-2-phenoxymethyl-6,7-dihydro-pyrazolo[1,5-a]pyrazine
Reaction equation
C(OC(=O)[NH:7][CH2:8][CH2:9][N:10]1[C:14]([C:15](=O)[CH3:16])=[CH:13][C:12]([CH2:18][O:19][C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)=[N:11]1)(C)(C)C>Cl.O1CCOCC1>[CH3:16][C:15]1[C:14]2[N:10]([N:11]=[C:12]([CH2:18][O:19][C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[CH:13]=2)[CH2:9][CH2:8][N:7]=1Participants
4
Procedure
[2-(5-Acetyl-3-phenoxymethyl-pyrazol-1-yl)-ethyl]-carbamic acid tert-butyl ester (0.2 g, 0.56 mmol) was dissolved in a 4M solution of HCl in 1,4-dioxane (2.12 mL) under nitrogen. The mixture was stirred at room temperature for 30 minutes and then the solvents evaporated in vacuo. The residue was basified with a saturated solution of Na2CO3 and extracted with DCM. The organic layer was separated, dried (Na2SO4), filtered and the solvents evaporated in vacuo to yield 4-methyl-2-phenoxymethyl-6,7-dihydro-pyrazolo[1,5-a]pyrazine (135 mg, 99% yield) as a brown solid that was used without further purification.