[C:1]([C:3]1[CH:4]=[C:5]([CH2:10][C:11]([OH:13])=[O:12])[CH:6]=[CH:7][C:8]=1[F:9])#[N:2].[Si](C=[N+]=[N-])(C)(C)[CH3:15]>C1COCC1.CO>[C:1]([C:3]1[CH:4]=[C:5]([CH2:10][C:11]([O:13][CH3:15])=[O:12])[CH:6]=[CH:7][C:8]=1[F:9])#[N:2]2-(3-Cyano-4fluorophenyl)acetic acid (4.0 g, 22.3 mmol) was diluted with THF (10 mL) and methanol (2 mL), placed under nitrogen and cooled to 0° C. TMSCHN2 (16.7 mL, 33.5 mmol) was added dropwise and the reaction was stirred for 30 minutes. The reaction was quenched with water and diluted with DCM. The layers were separated and the organic layer was dried over MgSO4, filtered and concentrated. The residue was purified using a Biotage 40M cartridge eluting with hexanes ethyl acetate (9.1) to yield methyl 2(3-cyano-4-fluorophenyl)acetate (1.76 g, 9.11 mmol, 41%) as clear oil that solidified to a white solid. 1H NMR (400 MHz, CDCl3) δ 7.48-7.59 (m, 2H), 7.19 (t, J=8.2 Hz, 1H), 3.73 (s, 3H), 3.64 (s, 2H).
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