Br[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([CH3:8])[C:3]=1[Cl:9].C([Sn](CCCC)(CCCC)OC)CCC.CC(=C)[CH2:27][C:28](=[O:30])[CH3:29].C1(C)C=CC=CC=1P(C1C=CC=CC=1C)C1C=CC=CC=1C>Cl[Pd]Cl.C1(C)C=CC=CC=1>[Cl:9][C:3]1[C:4]([CH3:8])=[CH:5][CH:6]=[CH:7][C:2]=1[CH2:27][C:28](=[O:30])[CH3:29]
A Smith process vial was charged with 1-bromo-2-chloro-3-methylbenzene (528 mg, 2.57 mmol, 1 eq.), tributylmethoxytin (1.11 mL, 1.5 eq.), 4-methylpent-4-en-2-one (0.42 mL, 1.5 eq.), PdCl2 (23 mg, 5%) and tri(o-tolyl)phosphine (79 mg, 10%), toluene (1 mL) was added and mixture sparged with nitrogen for 10 minutes and then heated in oil bath at 100° C. for 5 hours. The reaction mixture was diluted with ethyl acetate and washed with brine, dried (MgSO4), filtered, concentrated and purified by flash column chromatography (silica gel, 0 to 20% ethyl acetate/hexanes) to 1-(2-chloro-3-methylphenyl)propan-2-one (375 mg, 80% yield). 1H-NMR: 400 MHz, (CDCl3) δ: 7.19-7.02 (m, 3H), 3.82 (s, 2H), 2.38 (s, 3H), 2.18 (s, 3H).
Wird geladen…
