Cl[CH2:2][C:3]1[N:4]=[C:5]([CH:8]([CH3:10])[CH3:9])[O:6][CH:7]=1.[P:11]([O:18]CC)([O:15][CH2:16][CH3:17])[O:12][CH2:13][CH3:14].C(OCC)(=O)C>C(OCC)(=O)C.C(O)C>[CH:8]([C:5]1[O:6][CH:7]=[C:3]([CH2:2][P:11](=[O:18])([O:15][CH2:16][CH3:17])[O:12][CH2:13][CH3:14])[N:4]=1)([CH3:10])[CH3:9]A mixture of 4-chloromethyl-2-isopropyl-1,3-oxazole (1.12 g) and triethyl phosphite (2.57 g) was stirred at 160° C. for 16 hrs. Excess triethyl phosphite was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography and eluted with ethyl acetate-hexane (1:1, v/v), ethyl acetate, then ethyl acetate-ethanol (10:1, v/v) to give diethyl [(2-isopropyl-1,3-oxazol-4-yl)methyl]phosphonate as a colorless oil (1.67 g, yield 91%).
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