D-(-)-酒石酸二甲酯   、                                                                                      
(5S,8R,9R)-10-Methyl-8,9-bis(benzoyloxy)-4,7-dioxo-5-methyl-3,6-diazadecanedicarboxylate                                                                                                                                                              在
                                                                                                                                                                                 
4-二甲氨基吡啶   、                                                                                                  
N,N'-二环己基碳二亚胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                以51%的产率得到Tetramethyl (3R,4R,7S,13S,14S,20S,23R,24R)-4,23-Bis(benzoyloxy)-7,20-dimethyl-1,5,8,11,16,19,22,26-octaoxo-1,26-diphenyl-2,12,15,25-tetraoxa-6,9,18,21-tetraazahexacosane-3,13,14,24-tetracarboxylate