(3S,6S)-3,6-diisobutyl-4-(4-phenoxybenzoyl)piperazin-2-one 、
(3S,6S)-3-isobutyl-6-thiophen-2-yl-piperazin-2-one 、
5-(4-氟苯基)异噁唑-3-羧酸 以to give the product 428 as a light brown solid的产率得到(3S,6S)-4-(5-(4-fluorophenyl)isoxazole-3-carbonyl)-3-isobutyl-6-(thiophen-2-yl)piperazin-2-one