Water → N-(6-chloro-2-methylpyrimidin-4-yl)thiazol-2-amine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a cool (0° C.), stirring suspension of 2-aminothiazole (3.05 g, 0.0305 mol), 4,6-dichloro-2-methylpyrimidine (5.84 g, 0.0358 mol) in THF (50 mL) was added dropwise over 10 minutes via addition funnel a solution of t-BuOK (40 mL, 30% wt in THF, 0.1069 mol). The reaction was allowed to slowly warm to room temperature overnight. To the reaction was added water (40 mL) and the resulting clear solution was extracted with chloroform and then chloroform/methanol (4:1). The combined extracts were concentrated to near dryness to give a precipitate. The solid was collected by filtration to give the title material (3.559 g) as a solid. The filtrate was concentrated to dryness and the resulting solid was dissolved in boiling methanol and allowed to precipitate overnight aided with the addition of some water. The solid was collected by filtration, washed with water and air dried to give the title material (1.451 g) as a solid. The aqueous layer from the extraction was acidified with 10% HCl and a precipitate was formed. The solid was collected by filtration, washed with water to give the title material (1.559 g) as a solid. The solids were combined to give the title material (6.569 g, 95%). 1H NMR (400 MHz, DMSO-d6) δ (ppm): 2.53 (3H, s), 6.90 (1H, s), 7.21 (1H, d, J=3.5 Hz), 7.46 (1H, d, J=3.5 Hz), 11.87 (1H, s). LC/MS (M+H)+: 227, 229. HPLC ret. time (Condition E): 1.427 min.

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