(3S,6S)-3-isobutyl-6-propyl-piperazin-2-one 、
5-(3,4-二氟苯基)异噁唑-3-羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 184 (85 mg, 90% yield) as white solid的产率得到(3S,6S)-4-(5-(3,4-difluorophenyl)isoxazole-3-carbonyl)-3-isobutyl-6-propylpiperazin-2-one