(3S,6S)-3,6-diisobutylpiperazin-2-one   、                                                                                      
(1R,2R)-2-(4-methoxyphenyl)cyclopropanecarboxylic acid   、                                                                                      
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one                                                                                                                                                                                                                                                                                                          以to furnish product 239 (70 mg, 64% yield) as a white solid的产率得到(3S,6S)-3,6-diisobutyl-4-[(1R,2R)-2-(4-methoxy-phenyl)-cyclopropanecarbonyl]-piperazin-2-one