N,N-Dipropylethylamine → N-(2-methyl-5-(5-(3-oxocyclobutyl)-1,2,4-oxadiazol-3-yl)phenyl)imidazo[1,2-a]pyridine-3-carboxamide

HRID 1497855

Reaction equation

HRID 1497855 reaction equation
CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.[O:25]=[C:26]1[CH2:29][CH:28]([C:30]([OH:32])=O)[CH2:27]1.N(CC)(CCC)CCC.O[N:43]=[C:44]([C:46]1[CH:47]=[CH:48][C:49]([CH3:64])=[C:50]([NH:52][C:53]([C:55]2[N:59]3[CH:60]=[CH:61][CH:62]=[CH:63][C:58]3=[N:57][CH:56]=2)=[O:54])[CH:51]=1)[NH2:45]>CN(C=O)C>[CH3:64][C:49]1[CH:48]=[CH:47][C:46]([C:44]2[N:43]=[C:30]([CH:28]3[CH2:27][C:26](=[O:25])[CH2:29]3)[O:32][N:45]=2)=[CH:51][C:50]=1[NH:52][C:53]([C:55]1[N:59]2[CH:60]=[CH:61][CH:62]=[CH:63][C:58]2=[N:57][CH:56]=1)=[O:54]

Participants

6

Reactant 4

HCID 519799N,N-DipropylethylamineHCID 49133583-Oxocyclobutane-1-carboxylic acidHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 86677441N-(5-(N'-hydroxycarbamimidoyl)-2-methylphenyl)imidazo[1,2-a]pyridine-3-carboxamide

Product 1

HCID 71280448N-(2-methyl-5-(5-(3-oxocyclobutyl)-1,2,4-oxadiazol-3-yl)phenyl)imidazo[1,2-a]pyridine-3-carboxamide

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
110 °C

Procedure

HATU (1.41 g, 3.72 mmol) was added in one portion to a stirred solution of 3-oxocyclobutanecarboxylic acid (0.405 g, 3.55 mmol) and Pr2NEt (0.62 mL, 3.7 mmol) in dry DMF (5 mL). After 10 minutes, N-(5-(N′-hydroxycarbamimidoyl)-2-methylphenyl)imidazo[1,2-a]pyridine-3-carboxamide (9) (1.0 g, 3.23 mmol) was added in one portion and continued to stir for another 30 minutes. The resulting solution was heated (110° C.) for 30 minutes and then cooled to room temperature. The solvent was evaporated and the residue was partitioned with saturated NH4Cl and EtOAc. The organic layer was dried with MgSO4 and filtered. The residue was purified on silica gel using 10% MeOH in dichloromethane to obtain N-(2-methyl-5-(5-(3-oxocyclobutyl)-1,2,4-oxadiazol-3-yl)phenyl)imidazo[1,2-a]pyridine-3-carboxamide (10). 1H NMR (400 MHz, d6-DMSO) δ 10.20 (s, 1 H), 9.53-9.51 (m, 1 H), 8.71 (s, 1 H), 8.08 (d, J=1.6 Hz, 1 H), 7.91-7.88 (m, 1 H), 7.85 (dd, J=2.0, 8.0 Hz, 1 H), 7.72-7.68 (m, 1 H), 7.51 (d, J=8.4 Hz, 1 H), 7.34-7.30 (m, 1 H), 4.12-4.04 (m, 1 H), 3.70-3.53 (m, 4 H), 2.37 (s, 3 H). MS m/z 388.1 (M+1)+.

Workup

  1. temperaturecooled to room temperature
  2. customThe solvent was evaporated
  3. customthe residue was partitioned with saturated NH4Cl and EtOAc
  4. dry with materialThe organic layer was dried with MgSO4
  5. filtrationfiltered
  6. customThe residue was purified on silica gel using 10% MeOH in dichloromethane

Sources & evidence

ORD record
ord-b8a87f3c174741268d93bcd17fc20525
Source dataset
uspto-grants-2015_12
Patent number
US09199981B2

Linked notes

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