(3S,6S)-3,6-diisobutylpiperazin-2-one 、 5-[4-(Methylsulfonyl)phenyl]isoxazole-3-carboxylic acid 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 176 (73 mg, 67% yield) as a white solid的产率得到(3S,6S)-3,6-diisobutyl-4-(5-(4-(methylsulfonyl)phenyl)isoxazole-3-carbonyl)piperazin-2-one