m-Tolyl isocyanate → HCID 131735813, compound

Participants

Reaction Steps

To the solution of 3-(5-amino-1-benzothien-2-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine (734.6 mg, 2 mmol. 1 eq) in anhydrous THF (10 mL) at room temperature was added dropwise m-tolylisocyanate (0.251 mL, 1 eq). After the reaction was stirred at room temperature for 4 hours, it was partitioned between ethyl acetate and aqueous ammonium chloride. The organic layer was isolated, washed with saturated aqueous sodium bicarbonate, brine, and dried with anhydrous sodium sulfate. The upper solution layer was decanted, concentrated, and the solid residue was subject to a gradient column chromatography (DCM to MeOH-DCM 1:5). The products' fractions were collected, concentrated, the solid was triturated with EtOAc-Hex (1:7) yielding 1-{2-[2-amino-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]-1-benzothien-5-yl}-3-(3-methylphenyl)urea as a white powder upon filtration in amount of 407 mg.

Provenance & Evidence