Diethyl Malonate → Diethyl 2-(2-bromo-6-chlorobenzyl)malonate

HRID 1471675Notes

Reaction equation

HRID 1471675 reaction equation
[C:1]([O:9][CH2:10][CH3:11])(=[O:8])[CH2:2][C:3]([O:5][CH2:6][CH3:7])=[O:4].[H-].[Na+].[Br:14][C:15]1[CH:20]=[CH:19][CH:18]=[C:17]([Cl:21])[C:16]=1[CH2:22]Br.[NH4+].[Cl-]>CN(C=O)C.ClCCl.O.C(OCC)C>[Br:14][C:15]1[CH:20]=[CH:19][CH:18]=[C:17]([Cl:21])[C:16]=1[CH2:22][CH:2]([C:3]([O:5][CH2:6][CH3:7])=[O:4])[C:1]([O:9][CH2:10][CH3:11])=[O:8]

Participants

9

Reactant 4

HCID 7761Diethyl MalonateHCID 24758Sodium hydrideHCID 25517Ammonium ChlorideHCID 27568722-Bromo-6-chlorobenzyl bromide

Product 1

HCID 67983387Diethyl 2-(2-bromo-6-chlorobenzyl)malonate

Reagents, catalysts & solvents 4

HCID 962WaterSolventHCID 3283Diethyl EtherSolventHCID 6228DimethylformamideSolvent2×HCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

Diethyl malonate (8.33 mL, 54.59 mmol) was added dropwise to sodium hydride (60% oil dispersion) (2.28 g, 56.97 mmol) in DMF (55 mL) at 0° C. The mixture was stirred for 5 min at ambient temp, wherafter 1-bromo-2-(bromomethyl)-3-chlorobenzene (13.5 g, 47.5 mmol) dissolved in DMF (15 mL) was added dropwise at 0° C. The mixture was stirred at 0° C. for 20 min and ambient temp overnight. NH4Cl (aq) was added to quench the reaction. Diethyl ether was added followed by water. The phases were separated and the aqueous phase was extracted with diethyl ether. The combined organic phases were washed with brine and dried (MgSO4). The aqueous phase was extracted with dichloromethane. The organic phase was washed with brine. The solvents were evaporated to give 18.2 g (quantitative). 4 g of the crude material was dissolved in dichloromethane and purified by column chromatography eluting with gradients of ethyl acetate in heptanes. Fractions containing product were pooled and the solvents were evaporated to give the title compound. Yield: 3.32 g, 19%. 1H NMR (400 MHz, CDCl3) δ ppm 1.23 (t, 7H) 3.62 (d, 2H) 3.84 (m, 1H) 4.20 (q, 4H) 7.06 (t, 1H) 7.35 (dd, 1H) 7.50 (dd, 1H). MS (ES+) m/z 365 [M+H]+.

Workup

  1. additionwas added dropwise at 0° C
  2. customto quench
  3. customthe reaction
  4. customThe phases were separated
  5. extractionthe aqueous phase was extracted with diethyl ether
  6. washThe combined organic phases were washed with brine
  7. dry with materialdried (MgSO4)
  8. extractionThe aqueous phase was extracted with dichloromethane
  9. washThe organic phase was washed with brine
  10. customThe solvents were evaporated
  11. customto give 18.2 g (quantitative)
  12. custompurified by column chromatography
  13. washeluting with gradients of ethyl acetate in heptanes
  14. additionFractions containing product
  15. customthe solvents were evaporated

Sources & evidence

ORD record
ord-f4fb78fffb914d2284265452ed03f951
Source dataset
uspto-grants-2015_04
Patent number
US09012457B2

Reaction notes

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