Triethylamine → 4-[6-bromo-2-(methoxymethyl)-1H-1,3-benzodiazol-1-yl]-1,3,5-triazin-2-amine

Participants

Reaction Steps

To a solution of 2-N-(2-amino-5-bromophenyl)-1,3,5-triazine-2,4-diamine (1.00 g, 3.56 mmol) in DMF (5 mL) was introduced methoxyacetic acid (320 mg, 3.56 mmol), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (750 mg, 3.91 mmol), 1-hydroxy-7-azabenzotriazole (533 mg, 3.91 mmol) and triethylamine (720 mg, 7.11 mmol). The reaction mixture was stirred for 18 hr at RT and concentrated in vacuo. The residue was suspended in water (100 mL) and the resulting precipitate collected by filtration. After washing the filter cake with EtOAc (10 mL) and methanol (10 mL), the crude amide was dried on the filter. The intermediate amide was dissolved in glacial acetic acid (20 mL) and warmed to 140° C. for 15 minutes (microwave heating in 4 batches of equal volume). Following concentration of the reaction mixture in vacuo, toluene (20 mL) was introduced and the suspension concentrated in vacuo (repeated twice) to furnish the crude title compound as a brown oil: LC-MS: m/z=+334.90/336.75 (M+H)+. This compound, with LC-MS purity=86% UV, was used in the next step without further purification.

Provenance & Evidence