8-(1R,2S,4S)-Bicyclo[2.2.1]hept-2-yl-1-propyl-7-(2-trimethylsilanyl-ethoxymethyl)-3,7-dihydro-purine-2,6-dione                                                                                                                                                              在
                                                                                                                                                                                 
盐酸   、                                                                                                  
potassium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
N,N-二甲基甲酰胺                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 4-[5-((1R,2S,4S)-8-Bicyclo[2.2.1]hept-2-yl-2,6-dioxo-1-propyl-1,2,6,7-tetrahydro-purin-3-yl)-pentanoyl]-benzenesulfonyl fluoride