(3S,6S)-6-cyclopentyl-3-isobutylpiperazin-2-one 、
(1R,2S)-rel-2-(3,4-二氟苯基)环丙基甲酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish product 259 (32 mg, 71.8% yield) as a white solid的产率得到(3S,6S)-6-cyclopentyl-4-[(1R,2R)-2-(3,4-difluoro-phenyl)-cyclopropanecarbonyl]-3-isobutyl-piperazin-2-one