P([O-])([O-])([O-])=O.[K+].[K+].[K+].C(B([CH2:14][CH3:15])CC)C.Br[C:17]1[CH:18]=[C:19]([CH:22]=[C:23]([Cl:25])[CH:24]=1)[CH:20]=[O:21]>C1COCC1.CCOC(C)=O.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[Cl:25][C:23]1[CH:22]=[C:19]([CH:18]=[C:17]([CH2:14][CH3:15])[CH:24]=1)[CH:20]=[O:21]
PdCl2(dppf) (37 mg, 0.046 mmol), potassium phosphate (1.93 g, 9.11 mmol) and triethylborane (1M in hexane, 0.45 g, 4.56 mmol) were added to a solution of 3-bromo-5-chloro-benzaldehyde (1.0 g, 4.56 mmol) in THF (20 mL) at ambient temperature and the mixture was refluxed for 12 h. The reaction mixture was brought to ambient temperature, diluted with EtOAc and washed with water. The organic layer was dried (Na2SO4), filtered, concentrated and the residue was purified by column chromatography on silica (100-200 mesh) eluting with 2% EtOAc in petroleum ether to afford the title compound (330 mg, 41%) as a pale yellow liquid: 1H NMR (400 MHz, DMSO-d6) δ 9.97 (s, 1H), 7.75 (d, J=1.6 Hz 1H), 7.73 (s, 1H), 7.65 (s, 1H), 2.74-2.68 (m, 2H), 1.23 (t, J=7.6 Hz, 3H); ESIMS m/z 168.0 ([M]+); IR (thin film) 3071, 1699, 692 cm−1.
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