(3S,6S)-6-cyclopentyl-3-isobutylpiperazin-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 186 (87 mg, 90% yield) as a white solid的产率得到(3S,6S)-6-cyclopentyl-4-(5-(3,4-difluorophenyl)isoxazole-3-carbonyl)-3-isobutylpiperazin-2-one