(3S,7aR)-3-Isopropyl-7a-methyl-6-p-tolyl-tetrahydro-pyrrolo[2,1-b]oxazol-5-one   、                                                                                      
碘甲烷                                                                                                                                                              在
                                                                                                                                                                                 
仲丁基锂                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
(3S,6S,7aR)-3-Isopropyl-6,7a-dimethyl-6-p-tolyl-tetrahydro-pyrrolo[2,1-b]oxazol-5-one   、                                                                                             
(3S,6R,7aR)-3-Isopropyl-6,7a-dimethyl-6-p-tolyl-tetrahydro-pyrrolo[2,1-b]oxazol-5-one