(S)-2-(3-chloro-4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-benzoylamino)-3-methyl-butyric acid 、 (1R,2R)-2-{4'-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-biphenyl-4-ylcarbamoyl}-cyclopentanecarboxylic acid 、 2-phenyl-5-trifluoromethyl-oxazole-4-carboxylic acid (4-iodo-phenyl)-amide 、
4-氨基苯硼酸频哪醇酯 、
(cis)-1,2-cyclopentanedicarboxylic acid, mono(phenylmethyl)ester 在
benzyl ester 作用下,
以to afford (1R,2R)-2-{4′-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-biphenyl-4-carbonyl}-cyclopentanecarboxylic acid (or enantiomer)的产率得到(1R,2R)-2-{4'-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-biphenyl-4-carbonyl}-cyclopentanecarboxylic acid