methanesulfonic acid (3R,7S,9aR)-3-benzyl-2-(3,5-bis(trifluoromethyl)benzoyl)-octahydropyrido[1,2-a]pyrazin-7-yl ester   、                                                                                      
吗啉                                                                                                                                                              在
                                                                                                                                                                                 SiO2   、                                                                                                  Dichloromethane methanol ammonium hydroxide   、                                                                                                  3,5-bis(trifluoromethyl)phenyl-[(3R,7R,9aR)-3-benzyl-7-morpholin-4-yl-octahydropyrido[1,2-a]pyrazin-2-yl]-methanone   、                                                                                                  3,5-bis(trifluoromethyl)phenyl-[(3R,7S,9aR)-3-benzyl-7-morpholin-4-yl-octahydropyrido[1,2-a]pyrazin-2-yl]-methanone                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 40.0h,
                                                                                                                以to afford 3,5-bis(trifluoromethyl)phenyl-[(3R,7R,9aR)-3-benzyl-7-morpholin-4-yl-octahydropyrido[1,2-a]pyrazin-2-yl]-methanone (0.97 g, Rf 0.24 (CH2Cl2/MeOH/NH4OH 96:3.75:0.25)) (compound 29) and 3,5-bis(trifluoromethyl)phenyl-[(3R,7S,9aR)-3-benzyl-7-morpholin-4-yl-octahydropyrido[1,2-a]pyrazin-2-yl]-methanone (0.75 g, Rf 0.15 (CH2Cl2/MeOH/NH4OH 96:3.75:0.25)) (compound 30)的产率得到3,5-bis(trifluoromethyl)phenyl-[(3R,7R,9aR)-3-benzyl-7-morpholin-4-yl-octahydropyrido[1,2-a]pyrazin-2-yl]-methanone