(3S,6S)-6-cyclopentyl-3-isobutylpiperazin-2-one 、
7-fluoro-4,5-dihydronaphtho[2,1-d]isoxazole-3-carboxylic acid 、
( 3S,6S)-3,6-diiso-butyl-4-((1R,2R)-2-phenylcyclopropanecarbonyl)piperazin-2-one 以to furnish 305 (30 mg, 66.6% yield) as a white solid的产率得到(3S,6S)-6-cyclopentyl-4-(7-fluoro-4,5-dihydronaphtho[2,1-d]isoxazole-3-carbonyl)-3-isobutylpiperazin-2-one