(3S,6S)-4-(5-(3,4-difluorophenyl)isoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one 、
(3S,6S)-3,6-diisobutylpiperazin-2-one 、 5-[3-(Trifluoromethoxy)phenyl]isoxazole-3-carboxylic Acid 以to give the product 138 (41 mg, 58.5% yield) as colorless oil的产率得到(3S,6S)-3,6-diisobutyl-4-(5-(3-(trifluoromethoxy)phenyl)isoxazole-3-carbonyl)piperazin-2-one