O-[(Ethoxycarbonyl)cyanomethylenamino]-N,N,N',N'-tetramethyluronium tetrafluoroborate → HCID 67364070, compound

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Reaction Steps

0.675 mmol of TOTU and 1.35 mmol of EDIA were added to the filtrate containing 1-(2-fluoro-phenyl)-5-(pyrrolidine-1-carbonyloxy)-1H-pyrazole-3-carboxylic acid obtained in step 1. The mixture was stirred for 5 min at room temperature, and then 0.675 mmol of (S)-3-amino-3-(2-methyl-phenyl)-propionic acid were added and the mixture was stirred overnight at RT. Then the solvent was evaporated and the residue subjected to preparative HPLC to give the title compound in a yield of 67%.

Provenance & Evidence