Methyl 2-chloro-6-methoxyisonicotinate → 2-(1-Ethylpropyl)-6-methoxyisonicotinic acid methyl ester

HRID 1908739Notes

Reaction equation

HRID 1908739 reaction equation
[CH3:1][O:2][C:3](=[O:13])[C:4]1[CH:9]=[C:8]([O:10][CH3:11])[N:7]=[C:6](Cl)[CH:5]=1>O1CCOCC1.C1COCC1>[CH3:1][O:2][C:3](=[O:13])[C:4]1[CH:9]=[C:8]([O:10][CH3:11])[N:7]=[C:6]([CH:4]([CH2:9][CH3:8])[CH2:5][CH3:6])[CH:5]=1

Participants

4

Reactant 1

HCID 13339618Methyl 2-chloro-6-methoxyisonicotinate

Product 1

HCID 670268752-(1-Ethylpropyl)-6-methoxyisonicotinic acid methyl esterYield 99.4%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
85 °C

Procedure

Under argon, Pd(dppf) (83 mg, 101 μmol) is added to a solution of 2-chloro-6-methoxy-isonicotinic acid methyl ester (2.00 g, 9.92 mmol, see preparation of 2-isobutyl-6-methoxy-isonicotinic acid) in dioxane (30 mL). To this mixture, a solution of 1-ethyl-propyl zinkbromide (1.17 g, 9.92 mmol, 20 mL of a 0.5 M solution in THF) is added. The mixture is stirred at 85° C. for 16 h before the reaction is carefully quenched with water and extracted twice with EA. The combined org. extracts are dried over MgSO4, filtered and concentrated. The crude product is purified by CC on silica gel eluting with heptane:EA 9:1 to give 2-(1-ethyl-propyl)-6-methoxy-isonicotinic acid methyl ester (1.17 g) as a pale yellow oil; LC-MS: tR=1.08 min; [M+1]+=238.03.

Workup

  1. customis carefully quenched with water
  2. extractionextracted twice with EA
  3. dry with materialextracts are dried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe crude product is purified by CC on silica gel eluting with heptane:EA 9:1

Sources & evidence

ORD record
ord-5cdf930e6d7143888052d2fe457f9de3
Source dataset
uspto-grants-2013_12
Patent number
US08598208B2

Reaction notes

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