4-Chloro-3-nitrotoluene → 4-Methyl-2-nitro-1-(1-propen-2-yl)benzene

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

1-Chloro-4-methyl-2-nitrobenzene (0.771 mL, 5.83 mmol), 4,4,5,5-tetramethyl-2-(prop-1-en-2-yl)-1,3,2-dioxaborolane (1.32 mL, 6.99 mmol), bis(triphenyl phosphine)palladium(II) chloride (0.327 g, 0.466 mmol), sodium carbonate (0.741 g, 6.99 mmol) in water (2.9 mL) and dioxane (11.4 mL) was capped in two separate 10-20 mL vials and heated on a Biotage Initiator® microwave reactor for 30 minutes at 140° C., with external IR-sensor temperature monitoring from the side of the vessel. The contents of the two vials were combined and diluted with ethyl acetate and washed with water. The aqueous layer was extracted with ethyl acetate (2×). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated. Purification by flash column chromatography using 1-5% ethyl acetate/hexanes provided the title compound as a yellow oil (0.986 g, 95%): IR (thin film) 3084 (w), 2976 (m), 2919 (w), 1641 (w), 1560 (w), 1526 (vs), 1349 (s) cm−1; 1H NMR (400 MHz, CDCl3) δ 7.68-7.65 (m, 1H), 7.37-7.32 (m, 1H), 7.21 (d, J=7.9 Hz, 1H), 5.15 (p, J=1.5 Hz, 1H), 4.91 (p, J=1.0 Hz, 1H), 2.42 (s, 3H), 2.06 (t, J=1.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 148.06, 142.71, 138.30, 136.15, 133.38, 130.32, 124.29, 115.17, 23.32, 20.81.

Herkunft & Nachweise