Tert-butyl 4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-ynyl]piperazine-1-carboxylate → tert-butyl (Z)-4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-enyl]piperazine-1-carboxylate

HRID 1749954Notes

Reaction equation

HRID 1749954 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].CC([O-])=O.CC([O-])=O.[Pb+2]>[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/[CH:13]=[CH: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

Participants

4

Reactant 1

HCID 71278868Tert-butyl 4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-ynyl]piperazine-1-carboxylate

Product 1

HCID 86682057tert-butyl (Z)-4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-enyl]piperazine-1-carboxylateYield 69.8%

Reagents, catalysts & solvents 2

HCID 131709914Lindlars catalystCatalystHCID 702EthanolSolvent

Procedure

A solution of tert-butyl 4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-ynyl]piperazine-1-carboxylate (0.0801 g, 0.200 mmol) synthesized in Example B49, Step 2 in ethanol (5 mL) was added with Lindlar's catalyst (0.0800 g), and the mixture was stirred at room temperature for 4 hours under a hydrogen atmosphere. The reaction mixture was filtered through Celite, and then the filtrate was concentrated. The resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate) to obtain tert-butyl (Z)-4-[4-(6-methoxy-3-oxo-2,3-dihydrobenzofuran-7-yl)but-3-enyl]piperazine-1-carboxylate (0.0562 g, 69%).

Workup

  1. filtrationThe reaction mixture was filtered through Celite
  2. concentrationthe filtrate was concentrated
  3. customThe resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate)

Sources & evidence

ORD record
ord-7cab0036aa234187a34e0b42ee7b573e
Source dataset
uspto-grants-2015_10
Patent number
US09156827B2

Reaction notes

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