Water → (2S,4S)-4-{(3,5-bis-trifluoromethyl-benzyl)-[5-(1-methyl-1H-pyrazol-4-yl)-pyrimidin-2-yl]-amino}-2-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester

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A mixture of ((2S,4S)-4-(5-bromo-pyrimidin-2-ylamino)-2-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (2.84 mmol; 1.1 g), 3,5-bis(trifluoromethyl)benzyl bromide (4.3 mmol; 0.78 mL) and sodium hydride (60% dispersion in mineral oil, 4.3 mmol; 0.17 g) in DMF (9 mL) is stirred for 1 hour at room temperature under nitrogen. The reaction mixture is quenched with water then saturated ammonium chloride solution. The product is extracted twice with EtOAc. The combined organic layer is washed with brine, dried over MgSO4, filtered, and concentrated under reduced pressure. The obtained residue is passed though silica pad (eluent: n-hexane/EtOAc) to give (2S,4S)-4-[(3,5-bis-trifluoromethyl-benzyl)-(5-bromo-pyrimidin-2-yl)-amino]-2-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester. To a mixture of (2S,4S)-4-[(3,5-Bis-trifluoromethyl-benzyl)-(5-bromo-pyrimidin-2-yl)-amino]-2-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester, 1-methylpyrazol-3-yl-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (7.1 mmol, 1.48 g), tetrakis(triphenylphosphine)palladium(0) (0.43 mmol, 490 mg) and 2M aqueous sodium hydrogen carbonate (3.6 mL) in 1,2-dimethoxy-ethane (4 mL) is allowed to warm to 95° C. and stirred for 3 hours. The mixture is cooled to room temperature and then added water. The mixture is extracted with CH2Cl2, and the combined organic layer is dried over Na2SO4, filtrated, and concentrated under reduced pressure. The obtained residue is purified by silica gel column chromatography (eluent: n-hexane/EtOAc) to give (2S,4S)-4-{(3,5-bis-trifluoromethyl-benzyl)-[5-(1-methyl-1H-pyrazol-4-yl)-pyrimidin-2-yl]-amino}-2-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (1.3 g, 74% overall yield for 2 steps); ESI-MS m/z: 615 [M+1]+, Retention time 2.12 min (condition A).

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