(3S,6S)-3,6-diisobutylpiperazin-2-one 、
5-(4-氯-苯基)-异噁唑-3-羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 190 (60 mg, 70.9% yield) as a white solid的产率得到(3S,6S)-4-[3-(4-chloro-phenyl)-isoxazole-5-carbonyl]-3,6-diisobutyl-piperazin-2-one