8-[2-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-ethyl]-4-piperidin-1-yl-5,6,7,8-tetrahydro-pteridine-2-carbonitrile   、                                                                                      
一水合肼                                                                                                                                                              在
                                                                                                                                                                                 
2,2,2-三氟乙酸盐                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                以to afford 8-(2-Amino-ethyl)-4-piperidin-1-yl-5,6,7,8-tetrahydro-pteridine-2-carbonitrile (4 mgs) as the trifluoroacetate salt的产率得到8-(2-Amino-ethyl)-4-piperidin-1-yl-5,6,7,8-tetrahydro-pteridine-2-carbonitrile