(3S,6S)-4-(5-(3,4-difluorophenyl)isoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one 、
(3S,6S)-3,6-diisobutylpiperazin-2-one 、 5-(4-Dimethylcarbamoyl-phenyl)-isoxazole-3-carboxylic acid 以to give the product 139 (56.4 mg, 26.4% yield) as off-white solid的产率得到4-(3-((2S,5S)-2,5-diisobutyl-3-oxopiperazine-1-carbonyl)isoxazol-5-yl)-N,N-dimethylbenzamide