Acetic Acid → 3-(1-(4-amino-3-(3-fluoro-5-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl)-4-(3-(dimethylamino)prop-1-yn-1-yl)-1H-isochromen-1-one hydrochloride

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To a solution of benzyl (3-(3-(1-(4-amino-3-(3-fluoro-5-methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl)-1-oxo-1H-isochromen-4-yl)prop-2-yn-1-yl)(methyl)carbamate (100 mg, 0.158 mmol) in DCM (4 ml), 1M BBr3 in DCM (3 ml, 10.50 mmol) was added and the reaction was stirred overnight. Then, the solution was cooled to 0° C. and stirred for 1 h. Then, EtOH (1 ml) was added and solvent was removed under reduced. The resulting material was reacted in DCM (4 ml) with trioxane (0.049 ml, 0.472 mmol), N-isopropyl-N-methylpropan-2-amine (18.14 mg, 0.157 mmol) for 30 min. Then, sodium triacetoxyborohydride (100 mg, 0.472 mmol) and acetic acid (28.4 mg, 0.472 mmol) were added and the reaction stirred for 1 h. Solvent was removed and crude was purified by C18 flash chromatography ((H2O/ACN)) 95:5+0.1% HCOOH}:{(ACN/H2O) 95:5+HCOOH 0.1%} from 100:0 to 0:100 affording the title compound (5 mg, 10.03 mmol, 6.37% yield) as a white solid.

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