(3S,6S)-4-(5-(3,4-difluorophenyl)isoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one 、
(3S,6S)-3,6-diisobutylpiperazin-2-one 、 5-(4-chloro-2-fluorophenyl)isoxazole-3-carboxylic acid 以to give the product 143 (93.5 mg, 45.6% yield) as a white solid的产率得到(3S,6S)-4-(5-(4-chloro-2-fluorophenyl)isoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one