Sodium hydride → 4-{4-[2-(2,5-Dichloro-phenoxy)-5-fluoro-pyridine-3-carbonyl]-3,4-dihydro-2H-quinoxalin-1-yl}-butyric acid ethyl ester

HRID 1877416Notes

Reaction equation

HRID 1877416 reaction equation
[Cl:1][C:2]1[CH:27]=[CH:26][C:25]([Cl:28])=[CH:24][C:3]=1[O:4][C:5]1[C:10]([C:11]([N:13]2[C:22]3[C:17](=[CH:18][CH:19]=[CH:20][CH:21]=3)[NH:16][CH2:15][CH2:14]2)=[O:12])=[CH:9][C:8]([F:23])=[CH:7][N:6]=1.[H-].[Na+].[CH2:31]([O:33][C:34](=[O:39])[CH2:35][CH2:36][CH2:37]Br)[CH3:32]>CN(C=O)C>[CH2:31]([O:33][C:34](=[O:39])[CH2:35][CH2:36][CH2:37][N:16]1[C:17]2[C:22](=[CH:21][CH:20]=[CH:19][CH:18]=2)[N:13]([C:11]([C:10]2[C:5]([O:4][C:3]3[CH:24]=[C:25]([Cl:28])[CH:26]=[CH:27][C:2]=3[Cl:1])=[N:6][CH:7]=[C:8]([F:23])[CH:9]=2)=[O:12])[CH2:14][CH2:15]1)[CH3:32]

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 76300Ethyl 4-bromobutyrateHCID 59294514[2-(2,5-Dichloro-phenoxy)-5-fluoro-pyridin-3-yl]-(3,4-dihydro-2H-quinoxalin-1-yl)-methanone

Product 1

HCID 592945484-{4-[2-(2,5-Dichloro-phenoxy)-5-fluoro-pyridine-3-carbonyl]-3,4-dihydro-2H-quinoxalin-1-yl}-butyric acid ethyl esterYield 9%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of [2-(2,5-dichloro-phenoxy)-5-fluoro-pyridin-3-yl]-(3,4-dihydro-2H-quinoxalin-1-yl)-methanone (50.2 mg, 0.12 mmol, 1.0 equiv; Example 147) in anhydrous DMF (1 mL) was added sodium hydride (10.3 mg, 0.24 mmol, 2.0 equiv; 55% free-flowing powder moistened with oil; [CAS RN 7646-69-7]) and the reaction mixture stirred at rt. After 1 h, 4-bromo-butyric acid ethyl ester (545 mg, 400 μL, 2.80 mmol, 23.3 equiv; [CAS RN 2969-81-5]) was added and stirring continued under microwave heating to 120° C. for 30 min. Removal of the solvent mixture under reduced pressure and purification by preparative HPLC on reversed phase (Xterra® PrepMSC 18, 5 μm, 19×50 mm column equipped with a Gilson Liquid Handler 215 autosampler, two Rainin Dynamax® SD-300 pumps, a Sedex ELSD 75 lightscatter and a Dionex UVD 340S UV detector) eluting with a gradient of acetonitrile/water provided 5.5 mg (9%) of the title compound as a light yellow oil. MS (ISP): 532.2 [M+H]+.

Workup

  1. stirringstirring
  2. temperatureheating to 120° C. for 30 min
  3. customRemoval of the solvent mixture
  4. customunder reduced pressure and purification by preparative HPLC on reversed phase (Xterra® PrepMSC 18, 5 μm, 19×50 mm column
  5. customequipped with a Gilson Liquid Handler 215 autosampler, two Rainin Dynamax® SD-300 pumps
  6. washa Sedex ELSD 75 lightscatter and a Dionex UVD 340S UV detector) eluting with a gradient of acetonitrile/water

Sources & evidence

ORD record
ord-e1c73f6428254602ac62371131d93efb
Source dataset
uspto-grants-2012_11
Patent number
US08309734B2

Reaction notes

Loading…