2-formyl-5-(triethylsilyloxy)-pent-2-enoic acid methyl ester   、                                                                                      
乙烯基异丁醚                                                                                                                                                                                              以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                生成                                                 6-isobutoxy-4-[2-(triethylsilyloxy)-ethyl]-5,6-dihydro-4H-pyran-3-carboxylic acid methyl ester   、                                                                                             6-isobutoxy-4-[2-(triethylsilyloxy)-ethyl]-5,6-dihydro-Η-pyran-3-carboxylic acid methyl ester