(3S,6S)-3,6-dineopentylpiperazin-2-one 、
(1R,2R)-trans-2-phenyl-1-cyclopropanecarboxylic acid 、
( 3S,6S)-3,6-diiso-butyl-4-((1R,2R)-2-phenylcyclopropanecarbonyl)piperazin-2-one 以to furnish 281 (50 mg, 52% yield) as a white solid的产率得到(3S,6S)-3,6-dineopentyl-4-((1R,2R)-2-phenylcyclopropanecarbonyl)-piperazin-2-one