Reaction equation
[CH3:1][P:2](=[O:7])([O:5][CH3:6])[O:3][CH3:4].[Li]CCCC.C[O:14][C:15](=O)[CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([Cl:23])[CH:18]=1.CC(O)=O>C1COCC1>[CH3:4][O:3][P:2]([CH2:1][C:15](=[O:14])[CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([Cl:23])[CH:18]=1)(=[O:7])[O:5][CH3:6]Participants
6
Procedure
To a solution of dimethyl methylphosphonate (17.93 g, 144 mmol) in THF (270 mL) at −78° C. was slowly added n-BuLi (2.5M, 64.2 mL, 160.6 mmol). The reaction mixture was stirred for 1 h and (3-chloro-phenyl)-acetic acid methyl ester (26.93 g, 146 mmol) was slowly added. The reaction mixture was allowed to warm to room temperature and was stirred for 24 h. AcOH (15 mL) was added and the volatiles were removed in vacuo. The residue was diluted with CH2Cl2 and the organic solution was washed carefully with saturated aqueous NaHCO3 (3 times). The organic layer was dried (MgSO4), filtered and concentrated in vacuo. Purification by medium pressure chromatography (20% EtOAc in hexanes to EtOAc) provided the title compound (9.28 g).
Workup
- customat −78° C.
- stirringwas stirred for 24 h
- customthe volatiles were removed in vacuo
- additionThe residue was diluted with CH2Cl2
- washthe organic solution was washed carefully with saturated aqueous NaHCO3 (3 times)
- dry with materialThe organic layer was dried (MgSO4)
- filtrationfiltered
- concentrationconcentrated in vacuo
- customPurification by medium pressure chromatography (20% EtOAc in hexanes to EtOAc)
Sources & evidence
- ORD record
- ord-56faaacb883d4849b3bc82acb3f8d0cf
- Source dataset
- uspto-grants-2003_11
- Patent number
- US06642266B2
Linked notes
Loading…