4'-(4-acetamidobenzyl)-2,2-dimethyl-2,3-dihydro-5'H-spiro[chromene-4,2'-[1,4]oxazinan]-5'-one                                                                                                                                                              在
                                                                                                                                                                                 Chiralpak IA chiral stationary phase                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
(R)-(+)-2,2-dimethyl-N-(4'-acetamidobenzyl)-4-spiromorpholone-chromane   、                                                                                             
(S)-(-)-2,2-dimethyl-N-(4'-acetamidobenzyl)-4-spiromorpholone-chromane