{(3aS,6R,6aR)-6-[6-amino-2-(cyclopentyloxy)-9H-purin-9-yl]tetrahydrofuro[3,4-d][1,3]dioxole-4,4-diyl}dimethanol   、                                                                                      
{(3aS,6R,6aR)-6-[6-amino-2-(cyclopentyloxy)-9H-purin-9-yl]-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxole-4,4-diyl}dimethanol                                                                                                                                                              在
                                                                                                                                                                                 crude mixture   、                                                                                                  Acetonitrile ammonium acetate   、                                                                                                  
水合甲醇                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
water formic acid                                                                                  为溶剂,
                                                                                                                                                    反应 15.0h,
                                                                                                                以the desired product was obtained as a white solid (8.0 mg, >95% pure)的产率得到(3S,4R,5R)-5-[6-amino-2-(cyclopentyloxy)-9H-purin-9-yl]-2,2-bis(hydroxymethyl)tetrahydrofuran-3,4-diol