Carbamic acid (E)-1-(tert-butyl-dimethyl-silanyloxymethyl)-4-methyl-penta-2,4-dienyl ester                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
氯化亚砜   、                                                                                                  copper dichloride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以79%的产率得到(4aR,5S)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-3-methyl-1-oxo-1,2,4a,5-tetrahydro-1λ
4-oxazolo[3,4-b][1,2]thiazin-7-one