Diisopropylethylamine → [5-tert-Butyl-2-(3-morpholin-4-yl-phenyl)-2H-pyrazol-3-yl]-carbamic acid 2,2,2-trichloro-ethyl ester

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Reaction Steps

2,2,2-Trichloroethylchloroformate (175 mg, 0.82 mmol) was added dropwise to a solution of Intermediate 23d (190 mg, 0.63 mmol) and DIPEA (244 mg, 1.89 mmol) in THF (10 mL), and the mixture stirred at RT for 1.5 h. The mixture was diluted with water and extracted with EtOAc (×2). The combined organic layers were washed with brine, dried (MgSO4), filtered and evaporated in vacuo. The residue was purified by FCC, using 0-50% EtOAc in cyclohexane, to give the title compound (140 mg, 46%). LCMS (Method 4): Rt 3.94, m/z 475 [MH+].

Provenance & Evidence