Cesium carbonate → HCID 67362914, compound

Participants

Reaction Conditions

Reaction Steps

101 mg (0.245 mmol) of (S)-3-{[1-(2-fluoro-phenyl)-5-hydroxy-1H-pyrazole-3-carbonyl]-amino}-3-(2-methyl-phenyl)-propionic acid ethyl ester (prepared from 1-(2-fluoro-phenyl)-5-hydroxy-1H-pyrazole-3-carboxylic acid and ethyl (S)-3-amino-3-(2-methyl-phenyl)-propionate analogously as described in synthesis example 2) were dissolved in 3 ml of DMF, and 160 mg (0.5 mmol) of cesium carbonate and 41.3 mg (0.245 mmol) of 3-bromomethyl-3-methyl-oxetane were added. The mixture was stirred for 4 h at 65° C. After evaporation of the solvent the residue was subjected to an aqueous work-up with EA and 10% aqueous solution of citric acid. After removal of the solvent from the organic phase 100 mg (82%) of the product are obtained.

Provenance & Evidence