烯丙基三丁基锡   、                                                                                      
3-[(2R,3S)-3-(tert-Butyl-dimethyl-silanyloxy)-tetrahydro-pyran-2-yloxy]-propionaldehyde                                                                                                                                                              在
                                                                                                                                                                                 4 A molecular sieve   、                                                                                                  magnesium bromide                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (R)-1-[(2R,3S)-3-(tert-Butyl-dimethyl-silanyloxy)-tetrahydro-pyran-2-yloxy]-hex-5-en-3-ol   、                                                                                             (S)-1-[(2R,3S)-3-(tert-Butyl-dimethyl-silanyloxy)-tetrahydro-pyran-2-yloxy]-hex-5-en-3-ol