cis-6-[3-(2-fluoro-phenyl)-ureido]-3,4-dihydro-1H-isoquinoline-2-carboxylic acid 4-carboxymethyl-cyclohexyl ester 、
5-氨基四氮唑 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以46%的产率得到trans-6-[3-(2-fluoro-phenyl)-ureido]-3,4-dihydro-1H-isoquinoline-2-carboxylic acid 4-[(1H-tetrazol-5-ylcarbamoyl)-methyl]-cyclohexyl ester