1-Methylpiperazine → HCID 59909798, compound

HRID 1279828Notes

Reaction equation

HRID 1279828 reaction equation
[C:1]([O:5][C:6](=[O:28])[CH2:7][C@H:8]([C:18]1[O:22][N:21]=[C:20]([C:23]([O:25]CC)=O)[N:19]=1)[CH2:9][CH2:10][CH2:11][CH:12]1[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]1)([CH3:4])([CH3:3])[CH3:2].[CH3:29][N:30]1[CH2:35][CH2:34][NH:33][CH2:32][CH2:31]1>C(O)C>[CH:12]1([CH2:11][CH2:10][CH2:9][C@@H:8]([C:18]2[O:22][N:21]=[C:20]([C:23]([N:33]3[CH2:34][CH2:35][N:30]([CH3:29])[CH2:31][CH2:32]3)=[O:25])[N:19]=2)[CH2:7][C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:28])[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]1

Participants

4

Reactant 2

HCID 531671-MethylpiperazineHCID 59909797ethyl 5-{(1R)-1-[2-(tert-butoxy)-2-oxoethyl]4-cyclohexylbutyl}-1,2,4-oxadiazole-3-carboxylate

Product 1

HCID 59909798HCID 59909798, compoundYield 91.5%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Conditions

Temperature
60 °C

Procedure

A solution of ethyl 5-{(1R)-1-[2-(tert-butoxy)-2-oxoethyl]4-cyclohexylbutyl}-1,2,4-oxadiazole-3-carboxylate (Preparation 3) (300 mg, 0.76 mmol) in ethanol (4 ml) was treated with 1-methylpiperazine (0.84 ml, 7.60 mmol) and the resulting mixture was heated at 60° C. under a nitrogen atmosphere for 16 hours. The mixture was cooled and the solvent removed under reduced pressure. The residue was purified by column chromatography on silica gel eluting with a gradient system of dichloromethane:methanol (98:2) gradually changing to dichloromethane methanol (95:5) to afford the title compound (312 mg).

Workup

  1. temperatureThe mixture was cooled
  2. customthe solvent removed under reduced pressure
  3. customThe residue was purified by column chromatography on silica gel eluting with a gradient system of dichloromethane:methanol (98:2)

Sources & evidence

ORD record
ord-13021f923f364fe2971d642e6b59db07
Source dataset
uspto-grants-2002_09
Patent number
US06448278B2

Reaction notes

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