tert-butyl 4-[[(2S,3R)-2-(4-carbamoylpiperazine-1-carbonyl)-4-oxoazetidin-3-yl]methyl]piperidine-1-carboxylate   、                                                                                      
1-diisopropylmethoxycarbonylpiperazine-4-carbonylchloride                                                                                                                                                              在
                                                                                                                                         
4-二甲氨基吡啶                                                                                                                                                                                                                               三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                以29%的产率得到2,4-dimethylpentan-3-yl 4-[(2S,3R)-2-(4-carbamoylpiperazine-1-carbonyl)-3-[[1-[(2-methylpropan-2-yl)oxycarbonyl]piperidin-4-yl]methyl]-4-oxoazetidine-1-carbonyl]piperazine-1-carboxylate