Succinic anhydride → 4-(4-Bromo-2-methylphenyl)-4-oxobutanoic acid

反応式

[Br:1][C:2]1[CH:7]=[CH:6][C:5](I)=[C:4]([CH3:9])[CH:3]=1.C([Mg]Br)(C)C.[C:15]1(=[O:21])[O:20][C:18](=[O:19])[CH2:17][CH2:16]1>C1COCC1>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:15](=[O:21])[CH2:16][CH2:17][C:18]([OH:20])=[O:19])=[C:4]([CH3:9])[CH:3]=1

参加物

実験手順

To a solution of 4-bromo-1-iodo-2-methylbenzene (148 mg, 0.5 mmol) in THF (10 mL) at −25° C. was added isopropylmagnesium bromide (0.5 mL, 0.5 mmol) and stirred 3 h. Succinic anhydride (55 mg, 0.55 mmol) was added and the reaction was stirred 18 h. The mixture was quenched with water (10 mL) and washed with 1N NaOH (10 mL), 1N HCl (10 mL), brine (10 mL) and dried (MgSO4). The organic layer was concentrated in vacuo and the residue purified by flash chromatography (0-100% EtOAc/Hexane) to afford 55A (42 mg, 31%) as a crystalline solid. 1H NMR (400 MHz, CDCl3) δ ppm 0.98 (t, 3 H) 2.42 (q, 2 H) 2.73 (t, 2 H) 4.10 (t, 2 H) 6.82 (d, 1 H) 7.02 (d, 1 H) 7.09 (t, 2 H) 7.15 (t, 1 H) 7.36 (d, 1 H) 7.58-7.63 (m, 1 H).