2-Methyl-4-nitrophenol → 4-(2-Methyl-4-nitrophenoxy)pyridin-2-amine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

2-Amino-4-chloropyridine (5.0 g), N-methyl pyrrolidone (40 ml), 2-hydroxy-5-nitrotoluene (11.9 g) and diisopropylethylamine (20.1 g) were put in a reaction vessel, followed by heating and stirring under a nitrogen atmosphere at 150° C. for 5 days. The reaction mixture was cooled down to room temperature and concentrated under a reduced pressure. To the resultant residue was added a saturated aqueous solution of sodium hydrogencarbonate, followed by stirring at room temperature overnight. To the reaction mixture was added tetrahydrofuran (200 ml) to partition. The aqueous layer was extracted with diethyl ether (100 ml). The organic layer was washed with brine (100 ml×2), dried over anhydrous sodium sulfate, and concentrated under a reduced pressure. The precipitated solid was suspended in diethyl ether and filtered off. The solid was washed with diethyl ether:ethyl acetate=1:1, and dried under aeration to provide the titled compound (4.36 g, 45.7%) as a yellow solid.

Herkunft & Nachweise