Diisopropylethylamine → Benzyl 2-(2-amino-5-bromopyridin-3-ylamino)-2-oxoethyl(methyl)carbamate

Beteiligte Stoffe

Reaktionsschritte

To a mixture of 2-[(benzyloxycarbonyl)(methyl)amino]acetic acid (0.42 g, 1.88 mmol), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (0.75 g, 1.97 mmol) in N,N-dimethylformamide (3.0 mL), N,N-diisopropylethylamine (0.72 mL, 4.12 mmol) was added and the reaction mixture was stirred for 30 minutes at room temperature, followed by the addition of 5-bromo-2,3-diaminopyridine (0.35 g, 1.86 mmol), then stirred for 16 hours. It was diluted with ethyl acetate (50 mL), washed with aqueous lithium chloride (2×20 mL) and brine, dried over sodium sulfate, filtered and concentrated. Gradient flash chromatography (35% to 85% ethyl acetate in hexane) provided phenylmethyl{2-[(2-amino-5-bromopyridin-3-yl)amino]-2-oxoethyl}methylcarbamate (0.70 g, 96%). MS (EI) for C16H17BrN4O3: 394 (MH+).

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