(3S,6S)-6-cyclohexyl-3-isobutylpiperazin-2-one 、
5-(2,4-二氟苯基)-3-异噁唑羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 156 (50 mg, 55.7% yield) as a white solid的产率得到(3S,6S)-6-cyclohexyl-4-[5-(2,4-difluoro-phenyl)-isoxazole-3-carbonyl]-3-isobutyl-piperazin-2-one