[CH:1]([C:3]1[CH:10]=[CH:9][C:6]([C:7]#[N:8])=[CH:5][C:4]=1[CH3:11])=[O:2].[CH2:12]([O:14][C:15](=[O:18])[CH2:16]Cl)[CH3:13].CC[O-].[Na+].O>C1C=CC=CC=1.C(O)C>[C:7]([C:6]1[CH:9]=[CH:10][C:3]([CH:1]2[O:2][CH:16]2[C:15]([O:14][CH2:12][CH3:13])=[O:18])=[C:4]([CH3:11])[CH:5]=1)#[N:8]
A mixture of 4-formyl-3-methylbenzonitrile (1.5 g, 10.3 mmol) and chloroacetic acid ethyl ester (1.2 g, 10 mmol) were dissolved in 60 mL of dry benzene. Freshly prepared EtONa (12.4 mmol) in 8 mL of ethanol was added, and the mixture were stirred at room temperature for 2 hours. The mixture was added water, then extracted with EA, dried over Na2SO4 and distilled off solvent to afford 1.7 g of crude ethyl 3-(4-cyano-2-methylphenyl)oxirane-2-carboxylate. MS m/z: 232 (M+1)+.
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