Diisopropylethylamine → (R,E)-1-(3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)pyrrolidin-1-yl)-4-(cyclobutyl(methyl)amino)but-2-en-1-one

Participants

Reaction Steps

To a cooled solution of (R)-3-iodo-1-(pyrrolidin-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (4) (990 mg, 3.0 mmol), (E)-4-(cyclobutyl(methyl)amino)but-2-enoic acid (21) (871 mg, 3.0 mmol) and DIPEA (3.1 mL, 18 mmol) in DMF (15 mL) was added HBTU (1.74 g, 4.5 mmol). The resulting solution was stirred at RT overnight, then quenched with water. The layers were separated and the aqueous layer was extracted with 85% DCM/IPA(3×). The combined organic phase was dried over Na2SO4, filtered and concentrated. The residue was purified by flash chromatography to provided (R,E)-1-(3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)pyrrolidin-1-yl)-4-(cyclobutyl(methyl)amino)but-2-en-1-one (22) (1.71 g, quant. yield) as a white solid. LC-MS (ESI): m/z (M+1) 482.0.

Provenance & Evidence