1-庚基锂   、                                                                                      
2-Oxohexahydro-2H-cyclopenta[B]furan-4-carbaldehyde                                                                                                                                                              在
                                                                                                                                                                                 
三异丙氧基氯化钛                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
(1RS,5SR,6SR)-6-<(1SR)-1-Hydroxy-2-octynyl>-2-oxabicyclo<3.3.0>octan-3-one   、                                                                                             (1RS,5SR,6SR)-6-<(1RS)-1-Hydroxy-2-octynyl>-2-oxabicyclo<3.3.0>octan-3-one   、                                                                                             (1SR,5RS,6SR)-6-<(1RS)-1-Hydroxy-2-octynyl>-2-oxabicyclo<3.3.0>octan-3-one   、                                                                                             (1SR,5RS,6SR)-6-<(1SR)-1-Hydroxy-2-octynyl>-2-oxabicyclo<3.3.0>octan-3-one