乙酸酐   、                                                                                      
(5S,10S)-10-[(E)-3-(tert-Butyl-diphenyl-silanyloxy)-2-methyl-propenyl]-4-methoxy-2-oxo-1-oxa-spiro[4.5]deca-3,7-diene-7-carbaldehyde                                                                                                                                                              在
                                                                                                                                                                                 
三甲基氯硅烷   、                                                                                                  sodium iodide                                                                                                                                  作用下,
                                                                                                                                                                                        反应 0.67h,
                                                                                                                以92%的产率得到Acetic acid (5S,10S)-10-[(E)-3-(tert-butyl-diphenyl-silanyloxy)-2-methyl-propenyl]-4-methoxy-2-oxo-1-oxa-spiro[4.5]deca-3,8-dien-(7E)-ylidenemethyl ester