Tert-butyl 4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-ynyl]piperazine-1-carboxylate → Tert-butyl 4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)butyl]piperazine-1-carboxylate
Reaction equation
[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:6]2[C:7](=[O:10])[CH2:8][O:9][C:5]=2[C:4]=1[C:13]#[C:14][CH2:15][CH2:16][N:17]1[CH2:22][CH2:21][N:20]([C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH2:19][CH2:18]1>C(O)C.[Pd]>[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:6]2[C:7](=[O:10])[CH2:8][O:9][C:5]=2[C:4]=1[CH2:13][CH2:14][CH2:15][CH2:16][N:17]1[CH2:22][CH2:21][N:20]([C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[CH2:19][CH2:18]1Participants
4
Reactant 1
Product 1
Reagents, catalysts & solvents 2
Procedure
A solution of tert-butyl 4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-ynyl]piperazine-1-carboxylate (0.0883 g, 0.220 mmol) synthesized in Example B49, Step 2 in ethanol (6 mL) was added with 5% palladium/carbon (wetted with 50% water, 0.100 g), and the mixture was stirred at room temperature for 16 hours under a hydrogen atmosphere. The reaction mixture was filtered through Celite, the filtrate was concentrated, and the resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate) to obtain tert-butyl 4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)butyl]piperazine-1-carboxylate (0.0912 g, quantitative).
Workup
- filtrationThe reaction mixture was filtered through Celite
- concentrationthe filtrate was concentrated
- customthe resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate)
Sources & evidence
- ORD record
- ord-2e821652d0fe44e5be927dc421396710
- Source dataset
- uspto-grants-2015_10
- Patent number
- US09156827B2
Reaction notes
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