(3S,6S)-6-cyclohexyl-3-isobutylpiperazin-2-one 、
5-(4-氯-苯基)-异噁唑-3-羧酸 、
( 3S,6S)-3,6-diiso-butyl-4-((1R,2R)-2-phenylcyclopropanecarbonyl)piperazin-2-one 以to furnish compound 315 (47 mg, 51% yield) as colorless solid的产率得到(3S,6S)-4-(3-(4-chlorophenyl)isoxazole-5-carbonyl)-6-cyclohexyl-3-isobutylpiperazin-2-one