Diisopropylethylamine → 4-(5-Methylcarbamoyl-4-o-tolyl-pyridin-2-yl)-piperazine-1-carboxylic acid tert-butyl ester

HRID 352320Notes

Reaction equation

HRID 352320 reaction equation
Cl[C:2]1[CH:11]=[C:10]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[CH3:18])[C:5]([C:6]([NH:8][CH3:9])=[O:7])=[CH:4][N:3]=1.[C:19]([O:23][C:24]([N:26]1[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]1)=[O:25])([CH3:22])([CH3:21])[CH3:20].C(N(C(C)C)C(C)C)C>CN(C1C=CN=CC=1)C.ClCCl>[C:19]([O:23][C:24]([N:26]1[CH2:31][CH2:30][N:29]([C:2]2[CH:11]=[C:10]([C:12]3[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=3[CH3:18])[C:5]([C:6](=[O:7])[NH:8][CH3:9])=[CH:4][N:3]=2)[CH2:28][CH2:27]1)=[O:25])([CH3:22])([CH3:20])[CH3:21]

Participants

6

Reactant 3

HCID 81531DiisopropylethylamineHCID 143452tert-Butyl piperazine-1-carboxylateHCID 121673126-chloro-N-methyl-4-o-tolyl-nicotinamide

Product 1

HCID 543878244-(5-Methylcarbamoyl-4-o-tolyl-pyridin-2-yl)-piperazine-1-carboxylic acid tert-butyl esterYield 48%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Procedure

A mixture of 8.31 g (31.9 mmol) 6-chloro-N-methyl-4-o-tolyl-nicotinamide, 6.53 g (35.0 mmol) 1-tert-butoxycarbonyl piperazine, 16.7 ml (95.6 mmol) N-ethyldiisopropylamine and a catalytic amount of 4-(N,N-dimethylamino)-pyridine was heated at reflux over night. After cooling to room temperature the mixture was dissolved in dichloromethane and washed with two portions of 0.1 N aqueous hydrochloric acid solution. Drying with sodium sulfate and concentration gave 10.7 g of the crude product. Flash column chromatography afforded 6.28 g (48.0%) of the title compound as an off-white solid.

Workup

  1. temperatureat reflux over night
  2. washwashed with two portions of 0.1 N aqueous hydrochloric acid solution
  3. dry with materialDrying with sodium sulfate and concentration
  4. customgave 10.7 g of the crude product

Sources & evidence

ORD record
ord-02d4dae514fb427495605c867d04a1ae
Source dataset
uspto-grants-2004_06
Patent number
US06747026B2

Reaction notes

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