Tetrahydrofuran → Dimethyl 2-Oxo-3-methylheptylphosphonate

HRID 2057715Notes

Reaction equation

HRID 2057715 reaction equation
C([Li])CCC.[CH3:6][P:7](=[O:12])([O:10][CH3:11])[O:8][CH3:9].O1CCCC1.[CH3:18][CH:19]([CH2:25][CH2:26][CH2:27][CH3:28])[C:20](OCC)=[O:21]>C(O)(=O)C>[O:21]=[C:20]([CH:19]([CH3:18])[CH2:25][CH2:26][CH2:27][CH3:28])[CH2:6][P:7](=[O:12])([O:10][CH3:11])[O:8][CH3:9]

Participants

6

Reactant 4

HCID 8028Tetrahydrofuran2×HCID 12958Dimethyl methylphosphonateHCID 12714009Ethyl 2-methylhexanoateHCID 178418339Butyllithium

Product 1

HCID 12906670Dimethyl 2-Oxo-3-methylheptylphosphonate

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

n-Butyllithium (150 ml.) is slowly added to a solution of dimethyl methylphosphonate (25.6 g.) in 475 ml. of tetrahydrofuran (THF) at about -65° C. To the mixture is added a solution of racemic ethyl 2-methylhexanoate (18.4 g.) in 50 ml. of THF, and the resulting mixture is stirred at -70° C. for 2 hrs. Then, 16 ml. of acetic acid is added, and the mixture is concentrated under reduced pressure. The residue is mixed with dichloromethane (about 400 ml.) and water (about 50 ml.), shaken, and separated. The organic phase is dried over magnesium sulfate and concentrated. Distillation yields the title compound, 16.7 g., b.p. 126°-129° C./1 mm.

Workup

  1. customat about -65° C
  2. concentrationthe mixture is concentrated under reduced pressure
  3. additionThe residue is mixed with dichloromethane (about 400 ml.) and water (about 50 ml.)
  4. customseparated
  5. dry with materialThe organic phase is dried over magnesium sulfate
  6. concentrationconcentrated
  7. distillationDistillation

Sources & evidence

ORD record
ord-421871e641564f55a648d2b4df4a7242
Source dataset
uspto-grants-1980_07
Patent number
US04212811

Reaction notes

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