Thionyl Chloride → Methyl alpha-phenyl-1-[4-[[[4'-(trifluoromethyl)-[1,1'-biphenyl]-2-yl]carbonyl]amino]phenyl]-4-piperidineacetate

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Reaction Steps

Thionyl chloride (3.6 ml) was added to a clear solution of 4′-(trifluoromethyl)-[1,1′-biphenyl]-2-carboxylic acid (0.025 mol) in DMF (1 ml) and DCM (100 ml). The mixture was stirred and refluxed for one hour. The solvent was evaporated. DCM (50 ml) was added to the residue, then evaporated. The residue was dissolved in DCM (50 ml) and the solution was added dropwise to a solution of intermediate (18) (0.025 mol) in DCM (150 ml) and DIPEA (0.049 mol). The reaction mixture was stirred for 2 hours at room temperature. Water was added and this mixture was extracted twice. The separated organic layer was dried, filtered and the solvent evaporated. The residue was stirred in DIPE, filtered off, dried, and crystallized from 2-propanol (150 ml; later, 300 ml was added). The mixture was stirred for 2 hours at room temperature. The precipitate was filtered off, washed with 2-propanol and dried, yielding 8.58 g of methyl α-phenyl-1-[4-[[[4′-(trifluoromethyl)[1,1′-biphenyl]-2-yl]carbonyl]amino]phenyl]-4-piperidineacetate (intermediate 23).

Provenance & Evidence