(3S,6S)-6-cyclopentyl-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 157 (65 mg, 75.1% yield) as a white solid的产率得到(3S,6S)-6-cyclopentyl-4-[5-(2,4-difluoro-phenyl)-isoxazole-3-carbonyl]-3-isobutyl-piperazin-2-one