(3S,6S)-3,6-diisobutylpiperazin-2-one 、
5-(2-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 give the product 274 (85 mg, 72% yield) as a white solid的产率得到(3S,6S)-4-(5-(2-chlorophenyl)isoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one