N,N-Dimethyl-N'-(3-oxo-cyclohex-1-enyl)-formamidine   、                                                                                      
Acetic acid (2R,3S,4R,6R)-3-acetoxy-2-acetoxymethyl-6-(7-bromo-1-hydroxy-5,8-dioxo-5,8-dihydro-naphthalen-2-yl)-tetrahydro-pyran-4-yl ester                                                                                                                                                                                              以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以61%的产率得到Acetic acid (2R,3S,4R,6R)-3-acetoxy-2-acetoxymethyl-6-(8-hydroxy-1,7,12-trioxo-1,2,3,4,7,12-hexahydro-benzo[j]phenanthridin-9-yl)-tetrahydro-pyran-4-yl ester