6-氨基-5-氧代-[1,4]二氮杂烷-1-羧酸苄酯   、                                                                                      
(6E)-6,7,8,9-tetradeoxy-8,8-dimethyl-2-O-methyl-3,5-O-(1-methylethylidene)-gulo-non-6-enonic acid lactone                                                                                                                                                              在
                                                                                                                                                                                 
sodium 2-ethylhexanoic acid                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 144.0h,
                                                                                                                以42%的产率得到benzyl 6-{(R)-2-[(4R,5S,6R)-6-((E)-3,3-dimethylbut-1-enyl)-5-hydroxy-2,2-dimethyl-1,3-dioxinan-4-yl]-2-methoxyacetylamino}-5-oxoperhydro-1,4-diazepine-1-carboxylate