tert-butyl 3-(1-(dimethylcarbamoyl)spiro[indoline-3,4'-piperidine]-1'-yl)-8-azabicyclo[3.2.1]octane-8-carboxylate hydrochloride   、                                                                                      
1,4-二氧六环   、                                                                                      
盐酸                                                                                                                                                              在
                                                                                                                                                                                 
乙酸乙酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇   、                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以to provide 1′-(8-azabicyclo[3.2.1]octan-3-yl)-N,N-dimethylspiro[indoline-3,4′-piperidine]-1-carboxamide 6ad bis-hydrochloride as an off white solid (95% purity by LC/MS)的产率得到1'-(8-azabicyclo[3.2.1]octan-3-yl)-N,N-dimethylspiro[indoline-3,4'-piperidine]-1-carboxamide