Triethylamine → HCID 15409145, compound

HRID 1416238Notes

Reaction equation

HRID 1416238 reaction equation
[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:6]([CH:8]=[C:9]([C:11]([OH:13])=O)[N:10]=2)[CH:7]=1.[CH3:14][O:15][C:16]1[CH:21]=[CH:20][C:19]([N:22]2[CH2:27][CH2:26][NH:25][CH2:24][CH2:23]2)=[CH:18][CH:17]=1.C(P(=O)(OCC)OCC)#N.C(N(CC)CC)C>ClCCl.CN(C=O)C>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:6]([CH:8]=[C:9]([C:11]([N:25]3[CH2:24][CH2:23][N:22]([C:19]4[CH:18]=[CH:17][C:16]([O:15][CH3:14])=[CH:21][CH:20]=4)[CH2:27][CH2:26]3)=[O:13])[N:10]=2)[CH:7]=1

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 76257Diethyl cyanophosphonateHCID 2697221-(4-Methoxyphenyl)piperazineHCID 27576146-chloroimidazo[1,2-a]pyridine-2-carboxylic acid

Product 1

HCID 15409145HCID 15409145, compoundYield 66.6%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

To 6-chloroimidazo[1,2-a]pyridine-2-carboxylic acid (0.170 g) and 1-(4-methoxyphenyl)piperazine (Aldrich; 0.165 g) in dichloromethane (4 mL) are added diethyl cyanophosphonate (Aldrich; 0.157 mL) and triethylamine (0.144 mL), followed by DMF (2 mL). After stirring overnight, the mixture is quenched with aqueous sodium bicarbonate and then partitioned between dichloromethane and aqueous sodium bicarbonate. The organic layers are filtered through sodium sulfate and concentrated, and the residue is chromatographed on silica gel using methanol/dichloromethane (2/98) to give 0.212 g of 1-[(6-chloroimidazo[1,2-a]pyridin-2-yl)carbonyl]-4-(4-methoxyphenyl)piperazine; mp 180-181° C.: IR (mineral oil) 1620, 1517, 1237, 1246, 1230 cm-1. 1H NMR (CDCl3) δ3.16, 3.78, 3.97, 4.47, 6.86, 6.94, 7.21, 7.56, 8.10,8.20.

Workup

  1. customthe mixture is quenched with aqueous sodium bicarbonate
  2. custompartitioned between dichloromethane and aqueous sodium bicarbonate
  3. filtrationThe organic layers are filtered through sodium sulfate
  4. concentrationconcentrated
  5. customthe residue is chromatographed on silica gel

Sources & evidence

ORD record
ord-62e7d426063445229323c54c70bb7967
Source dataset
uspto-grants-1999_06
Patent number
US05912246

Reaction notes

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