Phenylhydrazine → HCID 46893525, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of the major diastereomer of tert-butyl N-(4-{1-[2-[3-chloro-2-fluoro-5-(trifluoromethyl)phenyl]-1-(4-chlorophenyl)-2-oxoethyl]butyl}benzoyl)-β-alaninate (EXAMPLE 2, Step A, 100 mg, 0.153 mmol) in pyridine (1.5 mL) was added phenylhydrazine (0.083 mL, 0.076 mmol). The mixture was stirred at 80° C. for 18 hours in a sealed tube. The mixture was diluted with EtOAc then washed with 2 N HCl (aq) then saturated NaCl (aq). The organic layer was dried over sodium sulfate, filtered, then concentrated. The resulting residue was purified by silica gel chromatography eluting with 0-50% EtOAc/hexanes to afford the title compound. This diastereomer was resolved to provide enantiopure material by HPLC on a ChiralPak IA column (2 cm×25 cm) eluting with 9 mL/min of 5% EtOH/n-heptane. LC1 2.98 min. (M-tBu+H)+ 668.

Provenance & Evidence