1-(6-amino-purin-9-yl)-O2,O3-isopropylidene-β-D-1-deoxy-allofuranuronic acid amide   、                                                                                      
丁酰氯                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 Butyric acid (S)-[(3aR,4S,6R,6aR)-6-(6-butyrylamino-purin-9-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl]-carbamoyl-methyl ester   、                                                                                             Butyric acid (R)-[(3aR,4S,6R,6aR)-6-(6-butyrylamino-purin-9-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl]-carbamoyl-methyl ester