Acetic Anhydride → 4-(1-acetylazetidin-3-yl)-9-[1-(4-amino-3-methyl-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl]-7-chloro-2,3,4,5-tetrahydro-1,4-benzoxazepine-6-carbonitrile

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The crude 9-[1-(4-amino-3-methyl-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl]-4-azetidin-3-yl-7-chloro-2,3,4,5-tetrahydro-1,4-benzoxazepine-6-carbonitrile trishydrochloride (0.015 g, 0.0278 mmol) was dissolved in N,N-dimethylformamide (2 mL) and cooled in an ice bath, and then N,N-diisopropylethylamine (0.0142 g, 0.112 mmol) and acetic anhydride (0.0032 mL, 0.033 mmol) were added. After stirring for 1 h, the product was purified without work up, by prep HPLC on a C-18 column eluting water:acetonitrile gradient buffered pH 10 to give 4-(1-acetylazetidin-3-yl)-9-[1-(4-amino-3-methyl-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl]-7-chloro-2,3,4,5-tetrahydro-1,4-benzoxazepine-6-carbonitrile as a white amorphous solid (0.004 g, 33%). LCMS calculated for C23H26ClN8O2 (M+H)+: m/z=481.2; found: 481.2.

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