4-[(4-bromo-benzyl)-(5-pentyl-pyridine-2-carbonyl)-amino]-piperidine-1-carboxylic acid tert-butyl ester   、                                                                                      
三氟乙酸                                                                                                                                                                                              以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以to give 1.29 g (quantitative yield) of 5-pentyl-pyridine-2-carboxylic acid (4-bromo-benzyl)-piperidin-4-yl-amide trifluoroacetate (71)的产率得到5-pentyl-pyridine-2-carboxylic acid (4-bromo-benzyl)-piperidin-4-yl-amide trifluoroacetate