benzyl 2(R)-<5(R)-carbomethoxy-3(S)-methyl-5-(5,6-dihydro)-5(S)-(methoxymethylenoxy)-6(S)-methyl-2(R)-pyranyl-2(S)-tetrahydrofuryl>butyl ether                                                                                                                                                              在
                                                                                                                                         Ni(Ra)                                                                                                                                                                                                                               
氢气                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙酸乙酯                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以85%的产率得到benzyl 2(R)-<5(R)-carbomethoxy-3(S)-methyl-5-(5(S)-(methoxymethylenoxy)-6(S)-methyl-2(R)-tetrahydropyranyl)-2(S)-tetrahydrofuryl>butyl ether