9-(2-indol-3-ylethyl)-1-oxa-4,9-diazaspiro<5.5>undecan-3-one hydrochloride   、                                                                                      
ammonium hydroxide                                                                                                                                                              在
                                                                                                                                                                                 
二氯甲烷                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
水                                                                                  为溶剂,
                                                                                                                                                                                        以to afford 3 g of 9-[2-(3-indolyl)ethyl]-1-oxa-4,9-diazaspiro[5.5]undecan-3-one as the free base, mp 48°-50° C.的产率得到9-[2-(3-indolyl)ethyl-]-1-oxa-4,9-diazaspiro[5.5] undecan-3-one