(3S,6S)-3,6-diisobutyl-4-(4-phenoxybenzoyl)piperazin-2-one 、
(3S,6S)-3,6-diisobutylpiperazin-2-one 、
3-(4-chlorophenyl)-5-isothiazolecarboxylic acid 以to give the product 105 (26 mg, 34.4% yield) as a colorless oil的产率得到(3S,6S)-4-(3-(4-chlorophenyl)isothiazole-5-carbonyl)-3,6-diisobutylpiperazin-2-one