(3R,4R)-4-(benzyloxycarbonylamino)-1-((4-(3-methoxyphenylamino)pyrrolo[2,1-f][1,2,4]triazin-5-yl)methyl)piperidine-3-carboxylic acid   、                                                                                      
3,4-二甲氧基苄胺                                                                                                                                                              在
                                                                                                                                                                                 (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate   、                                                                                                  
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         DMF (N,N-dimethyl-formamide)                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以95%的产率得到benzyl (3R,4R)-3-((3,4-dimethoxybenzyl)carbamoyl)-1-((4-(3-methoxyphenylamino)pyrrolo[2,1-f][1,2,4]triazin-5-yl)methyl)piperidin-4-ylcarbamate