1-(2'-Bromo-5'-methoxybenzoyl)-2-methyl-3,4-dihydro-6,7-methylenedioxyisoquinolium iodide                                                                                                                                                              在
                                                                                                                                                                                 sodium tetrahydroborate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以90%的产率得到erythro/threo-1-(2'-Bromo-5'-methoxy-α-hydroxybenzyl)-2-methyl-1,2,3,4-tetrahydro-6,7-methylenedioxyisoquinoline