tert-butyl-[[(2R,3S,6S)-6-methoxy-3-prop-2-ynoxy-3,6-dihydro-2H-pyran-2-yl]methoxy]-dimethylsilane   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                              在
                                                                                                                                                                                 
N-甲基吲哚酮                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (1S,7R,8S,10R,11R)-10-[[tert-butyl(dimethyl)silyl]oxymethyl]-8-methoxy-2,9-dioxatricyclo[5.3.1.04,11]undec-4-en-6-one