(5R)-5-isopropyl-3-(1-isoquinolinyl)-4,5-dihydro-5-isoxazole carboxylic acid 、
ethyl 3-amino-5-fluoro-4,4-dimethoxypentanoate 以100的产率得到5-fluoro-3-[((R)-5-isopropyl-3-(1-isoquinolinyl)-4,5-dihydro-isoxazole-5-carbonyl)-amino]-4,4-dimethoxy-pentanoic acid ethyl ester