甲醇   、                                                                                      
(3aS,7R,7aS)-2-amino-7-((tert-butyldimethylsilyl)oxy)-5,6,7,7a-tetrahydrooxazolo[4,5-c]pyridin-4(3aH)-one                                                                                                                                                              在
                                                                                                                                                                                 
sodium methylate                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.0h,
                                                                                                                以54%的产率得到methyl (4S,5S,6R)-2-amino-5-((tert-butyldimethylsilyl)oxy)-6-hydroxy-4,5,6,7-tetrahydro-1H-1,3-diazepine-4-carboxylate