Br[CH:2]([CH2:7][CH3:8])[C:3]([O:5][CH3:6])=[O:4].[CH2:9]([O:11][P:12]([O:16]CC)[O:13][CH2:14][CH3:15])[CH3:10]>>[CH3:6][O:5][C:3](=[O:4])[CH:2]([P:12]([O:13][CH2:14][CH3:15])([O:11][CH2:9][CH3:10])=[O:16])[CH2:7][CH3:8]Methyl 2-bromobutanoate (92 g, 0.508 mol) and triethylphosphite (95 g, 0.57 mol) were mixed, and the mixture was stirred at 110° C. for 3 days. The reaction mixture was dried under reduced pressure to give the title compound.
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