Water → 3-{5-Amino-3-[2-(tert-butyl-diphenyl-silanyloxy)-1,1-dimethyl-ethyl]-pyrazol-1-yl}-phenol

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Reaction Steps

A solution of Intermediate 153c (1.21 g, 2.1 mmol) in ethanol (IMS grade, 20 mL) was treated with water (1 mL) and ammonium formate (1.33 g, 21 mmol). The mixture was purged with N2 then 10% Pd/C (0.67 g, 0.63 mmol Pd) was added. The mixture was heated to reflux for 1 h then filtered through celite and the filtrate was concentrated in vacuo. The residue was partitioned between EtOAc and water. The phases were separated and the aqueous layer was extracted with EtOAc (×2). The combined organic phase was washed with brine, dried (Na2SO4) and concentrated in vacuo. The residue was purified by FCC, using 0-40% EtOAc in cyclohexane, to give the title compound (0.53 g, 41% over 2 steps) as a golden gum. LCMS (Method 3): Rt 4.55 min, m/z 486.5 [MH+].

Provenance & Evidence