Triethylamine → 4-(5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinolin-2-yl)-piperidine-1-carboxylic acid benzyl ester

HRID 1376236Notes

Reaction equation

HRID 1376236 reaction equation
[NH2:1][C:2]1[C:3](=[O:14])[N:4]([CH3:13])[C:5]2[C:10]([C:11]=1[NH2:12])=[CH:9][CH:8]=[CH:7][CH:6]=2.CCN(CC)CC.[CH2:22]([O:29][C:30]([N:32]1[CH2:37][CH2:36][CH:35]([C:38](Cl)=O)[CH2:34][CH2:33]1)=[O:31])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1>C(Cl)Cl>[CH2:22]([O:29][C:30]([N:32]1[CH2:37][CH2:36][CH:35]([C:38]2[NH:1][C:2]3[C:3](=[O:14])[N:4]([CH3:13])[C:5]4[CH:6]=[CH:7][CH:8]=[CH:9][C:10]=4[C:11]=3[N:12]=2)[CH2:34][CH2:33]1)=[O:31])[C:23]1[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 2776270Benzyl 4-(chlorocarbonyl)piperidine-1-carboxylateHCID 451232943,4-Diamino-1-methylquinolin-2(1H)-one

Product 1

HCID 587884444-(5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinolin-2-yl)-piperidine-1-carboxylic acid benzyl esterYield 18.1%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a suspension of 3,4-diamino-1-methyl-1H-quinolin-2-one (0.60 g, 1.59 mmol) in CH2Cl2 (10 mL) were added Et3N (0.177 g, 1.74 mmol) and 4-chlorocarbonyl-piperidine-1-carboxylic acid benzyl ester (0.45 g, 1.60 mmol) at 0° C. The reaction mixture was stirred at room temperature for 1.5 h, and then excess acid chloride was quenched by addition of MeOH. The mixture was concentrated in vacuo, and the amide intermediate was taken up in 5 mL of HOAc and heated at reflux for 7 h. After cooling to room temperature, the solvent was evaporated under reduced pressure. The cyclized product was purified by flash chromatography, to give 4-(5-methyl-4-oxo-4,5-dihydro-3H-imidazo[4,5-c]quinolin-2-yl)-piperidine-1-carboxylic acid benzyl ester (0.12 g, 18% yield). 1H-NMR (DMSO): δ 8.08 (m, 1H), 7.60 (m, 1H), 7.43 (m, 1H), 7.32 (m, 6H), 5.02 (s, 2H), 3.91 (m, 2H), 3.34 (s, 3H), 2.81 (m, 3H), 1.78 (m, 2H), 1.39 (m, 2H). MS: calculated for C24H24N4O3+H 417.2; found: 417.4.

Workup

  1. customexcess acid chloride was quenched by addition of MeOH
  2. concentrationThe mixture was concentrated in vacuo
  3. temperatureheated
  4. temperatureat reflux for 7 h
  5. temperatureAfter cooling to room temperature
  6. customthe solvent was evaporated under reduced pressure
  7. customThe cyclized product was purified by flash chromatography

Sources & evidence

ORD record
ord-cd14e6a57d1b4f08aaf1d3bc20ca27a1
Source dataset
uspto-grants-2007_01
Patent number
US07169926B1

Reaction notes

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