Lithium hydroxide, monohydrate → Lithium 2-(2-(2-(2-((4-((4-(tert-butoxycarbonyl)piperazin-1-yl)methyl)phenyl)amino)-5-(trifluoromethyl)pyrimidin-4-yl)ethyl)phenyl)acetate

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tert-Butyl 4-(4-((4-(2-(2-methoxy-2-oxoethyl)phenethyl)-5-(trifluoromethyl)pyrimidin-2-yl)amino)benzyl)piperazine-1-carboxylate (I96) (120 mg, 0.196 mmol) was dissolved in THF (4 mL), and a solution of lithium hydroxide hydrate (25 mg, 0.59 mmol) in water (1 mL) was added. The mixture was stirred at room temperature for 18 hours then concentrated and the residue evaporated twice from toluene to give the title compound (I97) as a tan solid which was used without purification. LCMS Method C: rt 5.17 min; m/z 600.2 [M−Li+2H]+; 544.1 [M−tBu−Li+3H]+; m/z 598.2 [M−Li]−.

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