[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][C:16]([O:18]C(C)(C)C)=[O:17])=[C:11]([C:23]#[N:24])[CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][C:16]([OH:18])=[O:17])=[C:11]([C:23]#[N:24])[CH:10]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A solution of tert-butyl [4-(benzyloxy)-2-cyanophenyl]acetate (0.48 g, 1.48 mmol) in DCM (7 ml) was treated with TFA (3.43 ml, 44.5 mmol) and the mixture stirred at RT for 30 min. The volatiles were removed in vacuo to afford the title compound. LC/MS (m/z): 268 (M+H)+.
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