diethyl 1,1-difluorohept-6-ynylphosphonate   、                                                                                      
2N-((N,N-dimethylamino)methylidene)-9-iodo-7N-(2-nitrophenylsulfonyl)-1N-(pivaloyloxy)methyl-9-deazaguanine                                                                                                                                                              在
                                                                                                                                                                                 bis-triphenylphosphine-palladium(II) chloride   、                                                                                                  
copper(l) iodide   、                                                                                                  
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以75%的产率得到9-[7',7'-difluoro-7'-(diethylphosphono)hept-1'-ynyl]-2-N-(N,N-dimethylaminomethylidene)-7-N-(2-nitrophenyl)sulfonyl-1N-(pivaloyloxy)methyl-9-deazaguanine