Guanidine Hydrochloride → HCID 15407403, compound

HRID 1417051Notes

Reaction equation

HRID 1417051 reaction equation
[CH2:1]([O:3][C:4]([N:6]1[CH2:11][CH2:10][CH:9]([N:12]2[C:16]([C:17](=O)[CH3:18])=[C:15]([C:20]3[CH:25]=[CH:24][C:23]([F:26])=[CH:22][CH:21]=3)[N:14]=[CH:13]2)[CH2:8][CH2:7]1)=[O:5])[CH3:2].[CH3:27]OC(OC)N(C)C.[NH2:35][C:36]([NH2:38])=[NH:37].Cl.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C.CCOC(C)=O.C(O)C>[CH2:1]([O:3][C:4]([N:6]1[CH2:7][CH2:8][CH:9]([N:12]2[C:16]([C:17]3[CH:18]=[CH:27][N:35]=[C:36]([NH2:38])[N:37]=3)=[C:15]([C:20]3[CH:21]=[CH:22][C:23]([F:26])=[CH:24][CH:25]=3)[N:14]=[CH:13]2)[CH2:10][CH2:11]1)=[O:5])[CH3:2]

Participants

8

Reactant 4

HCID 5742Guanidine HydrochlorideHCID 11430Potassium CarbonateHCID 78373Dimethylformamide dimethyl acetalHCID 99507171-(1-Ethoxycarbonyl-4-piperidinyl)-4-(4-fluorophenyl)-5-acetylimidazole

Product 1

HCID 15407403HCID 15407403, compoundYield 30%

Reagents, catalysts & solvents 3

HCID 702EthanolSolventHCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
120 °C

Procedure

To a solution of the ketoimidazole prepared in Example 2 above (2.6 g, 7.24 mmol) in 15 mL of DMF was added N,N-dimethylformamide dimethyl acetal (1.92 mL, 1.72 g, 14.5 mmol) and the solution was heated at 120° C. for 2 h. At this time, TLC and HPLC indicated no starting material and the solution was cooled to 95° C. and ethanol (30 mL), guanidine·HCl (2.77 g, 28.95 mmol) and K2CO3 (4.0 g, 28.9 mmol) were added. After 16 hours, HPLC indicated that the reaction was complete and the solution was cooled to room temperature. The solution was diluted with 100 mL of EtOAc and washed with 2×150 mL of 3N HCl. The aqueous layers were combined and basified with excess solid K2CO3 until the bubbling ceased. The aqueous layer was transferred to a separatory funnel and extracted 2×150 mL of EtOAc. The combined organics were dried over Na2SO4 and activated charcoal, filtered through Celite, and concentrated in vacuo. The residue was recrystallized from EtOAc/MeOH/Hexanes to yield the imidazole product (0.9 g, 30%) as a beige solid: mp=228-230° C.; IR (KBr) 3321, 3157, 1712, 1658, 1568, 1507, 1470, 1437 cm-1 ; 1H NMR (CDCl3) δ8.17 (1H, d, J=5.3 Hz), 7.71 (1H, s), 7.43 (2H, m), 7.00 (2H, t, J=8.7 Hz), 6.50 (1H, d, J=5.3 Hz), 5.16 (2H, br s), 4.74 (1H, tt, J=3.7, 12.0 Hz), 4.35 (2H, m), 4.15 (2H, q, J=7.1 Hz), 2.82 (2H, t, J=12.5 Hz), 2.15 (2H, d, J=12.5 Hz), 1.85 (2H, m), 1.28 (3H, t, J=7.1 Hz); 13C NMR (DMSO-d6) δ163.61, 162.76, 159.54, 158.66, 158.01, 154.35, 138.88, 136.25, 131.00, 129.16, 129.05, 124.98, 115.08, 114.80, 110.84, 60.64, 53.06, 42.70, 32.48, 14.43; Anal. Calcd for C21H23N6O2F; C, 61.4; H, 5.7; N, 20.5; Found C, 61.0, H, 5.5; N, 20.3.

Workup

  1. temperaturethe solution was cooled to 95° C.
  2. temperaturethe solution was cooled to room temperature
  3. washwashed with 2×150 mL of 3N HCl
  4. customThe aqueous layer was transferred to a separatory funnel
  5. extractionextracted 2×150 mL of EtOAc
  6. dry with materialThe combined organics were dried over Na2SO4 and activated charcoal
  7. filtrationfiltered through Celite
  8. concentrationconcentrated in vacuo
  9. customThe residue was recrystallized from EtOAc/MeOH/Hexanes

Sources & evidence

ORD record
ord-c6bc514a3f2c43cfbc882a8bc473c840
Source dataset
uspto-grants-1999_06
Patent number
US05917043

Reaction notes

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