(3S,6S)-3,6-diisobutyl-4-(4-phenoxybenzoyl)piperazin-2-one 、
(3S,6S)-3,6-diisobutylpiperazin-2-one 、
5-乙基异恶唑-3-甲酸 以to give the product 107 (13.5 mg, yield: 8.6% yield) as a white solid的产率得到(3S,6S)-4-(5-ethylisoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one