(3S,6S)-3,6-diisobutylpiperazin-2-one 、
4H-噻吩并[3,2-c]苯并吡喃-2-羧酸 、
( 3S,6S)-3,6-diiso-butyl-4-((1R,2R)-2-phenylcyclopropanecarbonyl)piperazin-2-one 以to furnish 307 (45 mg, 50.7% yield) as a white solid的产率得到(3S,6S)-3,6-diisobutyl-4-(4H-thieno[3,2-c]chromene-2-carbonyl)piperazin-2-one