Patent ID: 9725391
Date: 2017-08-08
CPC Classifications: C07B,C07C

Claim:
1. A method for preparing a diastereomic salt of 1-phenyl amine 2,2′-dihydroxy-1,1′-binaphthyl-3-carboxylate comprising: forming a solution by dissolving racemic 2,2′-dihydroxy-1,1′-binaphthyl-3-carboxylic acid in an organic solvent; adding a chiral 1-phenethylamine into the solution and reacting the chiral 1-phenethylamine with the racemic 2,2′-dihydroxy-1,1′-binaphthyl-3-carboxylic acid to form a solid precipitant comprising a diastereomic salt of 1-phenyl amine 2,2′-dihydroxy-1,1′-binaphthyl-3-carboxylate and a supernatant; and separating the thus formed solid precipitant from the supernatant to recover the diastereomic salt of 1-phenyl amine 2,2′-dihydroxy-1,1′-binaphthyl-3-carboxylate.