[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[C:8]([O:18][CH3:19])[C:9]=1OS(C(F)(F)F)(=O)=O)[CH:5]=[O:6].CN(C1C2C(N(C)C)=CC=CC=2C=CC=1)C>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C1(P(C2C=CC=CC=2)[C-]2C=CC=C2)C=CC=CC=1.[C-]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=C1.[Fe+2].CC#N>[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[C:8]([O:18][CH3:19])[CH:9]=1)[CH:5]=[O:6]Triflate 5 (9 g, 28 mmol), palladium(II) acetate (120 mg, 0.5 mmol), 1,1'-bis(diphenyiphosphino)ferrocene (620 mg, 1 mmol) and hplc grade CH3CN (10 ml) were mixed well in a teflon-lined stainless steel bomb. After adding freshly made, pulverized proton sponge formate2 (7.84 g, 30 mmol), the bomb was sealed and heated at 90° C. for 4 h. The cooled reaction was then filtered to remove proton sponge crystals, partitioned between EtOAc and 3N HCl, washed once each with dilute brine and dilute NaHCO3, dried over Na2SO4, and evaporated. Silica gel chromatography (15% EtOAc/hexanes) yielded 4.25 g (88.5%) of chloromethoxybenzaldehyde 6, mp 45° C.
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