Bromopinacolone → (S)-2-{[5-(3,3-Dimethyl-2-oxo-butoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-pentanedioic acid 5-tert-butyl ester 1-methyl ester

Participants

Reaction Steps

Crude (S)-2-[(5-Hydroxy-1-phenyl-1H-pyrazole-3-carbonyl)-amino]-pentanedioic acid 5-tert-butyl ester 1-methyl ester (44 g) was dissolved in DMF and treated with 12.2 g potassium tert-butoxide and 14.7 ml 1-bromopinacolone. After 2 h the solvent was removed in vacuo, the residue taken up in DCM and extracted with water. The crude product obtained after evaporation of the solvent was purified by flash column chromatography on silica eluting with heptane/ethyl acetate giving the title compound as colorless oil (45 g).

Provenance & Evidence