Diisopropylethylamine → N-[(2-oxo-4-pyridin-2-yl-1,2,4,5-tetrahydroimidazo[1,5,4-de][1,4]benzoxazin-4-yl)methyl]acetamide

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Reaction Steps

Triphosgene (20 mg, 0.07 mmol) was added to a mixture of N-[(5-amino-3-pyridin-2-yl-3,4-dihydro-2H-1,4-benzoxazin-3-yl)methyl]acetamide (50 mg, 0.2 mmol), tetrahydrofuran (5 mL) and N,N-diisopropylethylamine (60 μL) at room temperature. The reaction was stirred for 1 h then partitioned between ethyl acetate and water. The organic layer was washed with brine, dried over magnesium sulfate, filtered, and concentrated to give crude N-[(2-oxo-4-pyridin-2-yl-1,2,4,5-tetrahydroimidazo[1,5,4-de][1,4]benzoxazin-4-yl)methyl]acetamide (0.040 g. 70%). LCMS calculated for C17H17N4O3 (M+H)+: m/z=325.1. found: 325.1.

Provenance & Evidence