4-氨基四氢吡喃   、                                                                                      
8-cyclopentyl-6-{5-(5-isobutyl-[1,3,4]oxadiazol-2-yl)-2-methyl-phenyl}-2-methanesulfinyl-8H-pyrido[2,3-d]pyrimidin-7-one                                                                                                                                                              在
                                                                                                                                                                                 
乙酸乙酯   、                                                                                                  hexanes                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
异丙醇                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以to give 8-cyclopentyl-6-{5-(5-isobutyl-[1,3,4]oxadiazol-2-yl)-2-methyl-phenyl}-2-(tetrahydro-pyran-4-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one (Yield: 16.0 mg, 38%)的产率得到8-cyclopentyl-6-{5-(5-isobutyl-[1,3,4]oxadiazol-2-yl)-2-methyl-phenyl}-2-(tetrahydro-pyran-4-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one