[O-]S(C(F)(F)F)(=O)=O.[Li+].[F:10][C:11]([F:16])([F:15])[CH:12]1[CH2:14][O:13]1.[CH2:17]([NH2:24])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1>CC#N>[CH2:17]([NH:24][CH2:14][CH:12]([OH:13])[C:11]([F:16])([F:15])[F:10])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1Lithium triflate was suspended in CH3CN (15 mL) and the mixture is cooled to −10° C. 2-(Trifluoromethyl)oxirane is added and the suspension is allowed to warm to RT with stirring. Benzylamine (6.33 mL, 58 mmol, Aldrich) is added all-at-once and the resultant solution is stirred for 25 minutes. The reaction is quenched by pouring into CH2Cl2 (200 mL) and washing 3× with H2O (200 mL). The organic layer is dried over Na2SO4 and filtered. The product is purified on a Biotage Flash 75L using 20:70:10 CH2Cl2:pentane:triethylamine as eluent. The product containing fractions are pooled and the solvent is removed by rotary evaporation. The product is dried under vacuum at 100° C. yielding a white crystalline solid.
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