Triphenylphosphine → 2-[3-(5-Amino-3-tert-butyl-pyrazol-1-yl)-phenoxy]-ethanol

Participants

Reaction Steps

A solution of Intermediate 95a (1.2 g, 5.2 mmol) and triphenyl phosphine (2.72 g, 10.4 mmol) in THF (30 mL), under an atmosphere of argon was treated with 2-(tetrahydro-pyran-2-yloxy)-ethanol (1.05 mL, 7.78 mmol), followed by the dropwise addition of diisopropylazodicarboxylate (1.64 mL, 10.4 mmol). The reaction mixture was then stirred at RT for 1 h. The reaction mixture was eluted on a SCX-2 cartridge using MeOH and 2M NH3 in MeOH. The basic fractions were evaporated under reduced pressure and the product was purified by FCC, using EtOAc/DCM 0-60% to afford the title compound as a brown gum (1.0 g, 80%). LCMS (Method 3): Rt 2.27 min, m/z 276 [MH+].

Provenance & Evidence