(3S,6S)-3,6-diisobutyl-4-(4-phenoxybenzoyl)piperazin-2-one 、
(3S,6S)-6-cyclopentyl-3-isobutylpiperazin-2-one 、
4-fluoro-5-(4-fluorophenyl)isoxazole-3-carboxylic acid 以to give the product 381 (51.6 mg, 54% yield) as a white solid的产率得到(3S,6S)-6-cyclopentyl-4-(4-fluoro-5-(4-fluorophenyl)isoxazole-3-carbonyl)-3-isobutylpiperazin-2-one