2,3-Dihydrofuran → 1-Methoxy-4-{(tetrahydro-furan-2-yloxy)-[2-(2,4,6-trimethyl-phenyl)-acetyl]-amino}-piperidine-4-carboxylic acid methyl ester

HRID 1473780Notes

Reaction equation

HRID 1473780 reaction equation
[CH3:1][O:2][C:3]([C:5]1([N:13]([OH:26])[C:14](=[O:25])[CH2:15][C:16]2[C:21]([CH3:22])=[CH:20][C:19]([CH3:23])=[CH:18][C:17]=2[CH3:24])[CH2:10][CH2:9][N:8]([O:11][CH3:12])[CH2:7][CH2:6]1)=[O:4].[O:27]1[CH:31]=[CH:30][CH2:29][CH2:28]1.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>ClCCl>[CH3:1][O:2][C:3]([C:5]1([N:13]([O:26][CH:28]2[CH2:29][CH2:30][CH2:31][O:27]2)[C:14](=[O:25])[CH2:15][C:16]2[C:17]([CH3:24])=[CH:18][C:19]([CH3:23])=[CH:20][C:21]=2[CH3:22])[CH2:6][CH2:7][N:8]([O:11][CH3:12])[CH2:9][CH2:10]1)=[O:4]

Participants

5

Reactant 3

HCID 709342,3-DihydrofuranHCID 521998p-Toluenesulfonic acid monohydrateHCID 584280024-{Hydroxy-[2-(2,4,6-trimethyl-phenyl)-acetyl]-amino}-1-methoxy-piperidine-4-carboxylic acid methyl ester

Product 1

HCID 584280531-Methoxy-4-{(tetrahydro-furan-2-yloxy)-[2-(2,4,6-trimethyl-phenyl)-acetyl]-amino}-piperidine-4-carboxylic acid methyl ester

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 4-{hydroxy-[2-(2,4,6-trimethyl-phenyl)-acetyl]-amino}-1-methoxy-piperidine-4-carboxylic acid methyl ester (compound P3ii.3 obtained in analogy to preparation example 11, step 4) (70 g, 192.1 mmol) in dichloromethane (1500 ml) under argon atmosphere was added 2,3-dihydro-furan (29.1 ml, 26.9 g, 384.1 mmol) and a catalytic amount of p-toluenesulfonic acid monohydrate (1.94 g, 19.2 mmol). The reaction mixture was stirred at reflux for 7 hours, filtered and concentrated. The residue was triturated with hexane, filtered and the solid dried in vacuo. Yield: 70.0 g of 1-methoxy-4-{(tetrahydro-furan-2-yloxy)-[2-(2,4,6-trimethyl-phenyl)acetyl]-amino}-piperidine-4-carboxylic acid methyl ester (compound P3ii.6) as a solid, mp 107-109° C. This material was used without further purification in the next step.

Workup

  1. temperatureat reflux for 7 hours
  2. filtrationfiltered
  3. concentrationconcentrated
  4. customThe residue was triturated with hexane
  5. filtrationfiltered
  6. customthe solid dried in vacuo
  7. customThis material was used without further purification in the next step

Sources & evidence

ORD record
ord-7594271058ec47179f730815a600e655
Source dataset
uspto-grants-2015_04
Patent number
US09018135B2

Reaction notes

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