2-(4-methylphenyl)ethyl trifluoromethanesulfonate   、                                                                                      
(S)-5,6,7,8-tetrahydro-4-propyl-6-propylamino-1-naphthol                                                                                                                                                              在
                                                                                                                                                                                 sodium sulfite                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
5,5-dimethyl-1,3-cyclohexadiene                                                                                  为溶剂,
                                                                                                                                                    反应 48.0h,
                                                                                                                以2.52 kg的产率得到(S)-5 ,6,7,8-tetrahydro-4-propyl-6-[N-[2-(4-methylphenyl)ethyl]-N-propylamino]-1-naphthol