1-(acetyloxy)-1-(trimethylsilyl)-2-propene   、                                                                                      
(2R,3R,4R,5S)-3,4,5-tris(phenylmethoxy)-2-(phenylmethoxymethyl)-3,4,5,6-tetrahydro-2H-pyran-6-ylium                                                                                                                                                                                                                                                                                                          生成                                                 
   、                                                                                             Acetic acid (E)-3-((2R,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-propenyl ester