Carbon Dioxide → 1,1-Dimethylethyl 4-[3-[(4-methoxyphenyl)methyl]-1,2,4-oxadiazol-5-yl]-1-piperidinecarboxylate

HRID 1992066Notes

Reaction equation

HRID 1992066 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([C:14]([OH:16])=O)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(N1C=CN=C1)(N1C=CN=C1)=O.C(=O)=O.O/[N:33]=[C:34](\[NH2:44])/[CH2:35][C:36]1[CH:41]=[CH:40][C:39]([O:42][CH3:43])=[CH:38][CH:37]=1>CN(C=O)C.CCOC(C)=O>[CH3:43][O:42][C:39]1[CH:40]=[CH:41][C:36]([CH2:35][C:34]2[N:33]=[C:14]([CH:11]3[CH2:10][CH2:9][N:8]([C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[CH2:13][CH2:12]3)[O:16][N:44]=2)=[CH:37][CH:38]=1

Participants

7

Reactant 4

HCID 280Carbon DioxideHCID 682631,1'-CarbonyldiimidazoleHCID 3928711-(tert-Butoxycarbonyl)-4-piperidinecarboxylic acidHCID 53568676965-38-4

Product 1

HCID 587285131,1-Dimethylethyl 4-[3-[(4-methoxyphenyl)methyl]-1,2,4-oxadiazol-5-yl]-1-piperidinecarboxylate

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolvent2×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
70 °C

Procedure

1-(tert-Butoxycarbonyl)piperidine-4-carboxylic acid (2.29 g, 10.0 mmoles) in 10 mL DMF was treated with 1,1′-carbonyldiimidazole (1.62 g, 10 mmoles, 1 eq.) at ambient temperature for 30 min until CO2 evolution ceased. (1Z)-N′-hydroxy-2-(4-methoxyphenyl)ethanimidamide [J. Med. Chem., 36(11), 1529 (1993)] (10.0 mmoles, 1 eq.) was dissolved in 5 mL DMF and added to the reaction mixture. The reaction mixture was heated at 70° C. for 6 h then at 120° C. for an additional 6 h. The reaction mixture was diluted with EtOAc and washed successively with water, 1N citric acid, saturated aqueous NaHCO3, and brine. The organic phase was isolated, dried over MgSO4, filtered and concentrated to give the title compound as an amber oil. 1H NMR (300 MHz, CDCl3) δ 7.26 (d, 2H, J=8.5 Hz), 6.88 (d, 2H, J=8.5 Hz), 4.10 (m, 2H), 4.00 (s, 2H), 3.80 (s, 3H), 3.08 (m, 1H), 2.97-2.90 (m, 2H), 2.04 (m, 2H), 1.87-1.73 (m, 2H), 1.47 (s, 9H). ES-LCMS m/z 395.99 (M+Na).

Workup

  1. additionadded to the reaction mixture
  2. washwashed successively with water, 1N citric acid, saturated aqueous NaHCO3, and brine
  3. customThe organic phase was isolated
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-6280f2a4d5f64ec7a1b0a24737615dda
Source dataset
uspto-grants-2010_01
Patent number
US07645771B2

Reaction notes

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