[1-(Tert-butoxycarbonylamino-methyl)-6,7-dimethoxy-isoquinolin-4-yl]-acetic acid   、                                                                                      
4-甲氧基苄胺   、                                                                                      
氰基磷酸二乙酯   、                                                                                                                                                                                                                                                                                                                                                                                                以to give {6,7-dimethoxy-4-[(4-methoxy-benzylcarbamoyl)-methyl]-isoquinolin-1-ylmethyl}-carbamic acid tert-butyl ester (74 mg, 80.7%)的产率得到{6,7-dimethoxy-4-[(4-methoxy-benzylcarbamoyl)-methyl]-isoquinolin-1-ylmethyl}-carbamic acid tert-butyl ester