(R)-methoxytrifluoromethylphenylacetyl chloride   、                                                                                      
N-{9-[(3aS,4R,6aR)-6-((R)-1-Hydroxy-ethyl)-2,2-dimethyl-4,6a-dihydro-3aH-cyclopenta[1,3]dioxol-4-yl]-9H-purin-6-yl}-benzamide                                                                                                                                                              在
                                                                                                                                                                                 
4-二甲氨基吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以66%的产率得到(S)-3,3,3-Trifluoro-2-methoxy-2-phenyl-propionic acid (R)-1-[(3aR,6R,6aS)-6-(6-benzoylamino-purin-9-yl)-2,2-dimethyl-6,6a-dihydro-3aH-cyclopenta[1,3]dioxol-4-yl]-ethyl ester