2-甲基-1,3-二噻烷   、                                                                                      
(5R,2'S,4'aR,7'R,7'aS)-5-Formyldihydro-2,2-dimethyl-6'-oxo-2'-phenyl-spiro<1,3-dioxolane-4,7'(6'H)-<7aH>furo<3,2-d><1,3>dioxin>-7'a-carboxylic acid phenylmethyl ester                                                                                                                                                              在
                                                                                                                                                                                 
正丁基锂                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃   、                                                                                         
正己烷                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 (3aR,5aR,8S,9aS,12R,12aR)-Tetrahydro-2,2-dimethyl-12-(2-methyl-1,3-dithian-2-yl)-8-phenyl-4H,10H-1,3-dioxolo<4',5'>pyrano<3',4':3,4>furo<3,2-d><1,3>dioxin-4,10-dione   、                                                                                             <5S,5(1R),2'R,4'aS,7'S,7'aR>-Dihydro-5-
-2,2-dimethyl-6'-oxo-2'-phenyl-spiro<1,3-dioxolane-4,7'(6'H)-<7aH>furo<3,2-d><1,3>dioxin>-7'a-carboxylic acid phenylmethyl ester   、                                                                                             <5R,5(1S),2'S,4'aR,7'R,7'aS>-Dihydro-5--2,2-dimethyl-6'-oxo-2'-phenyl-spiro<1,3-dioxolane-4,7'(6'H)-<7aH>furo<3,2-d><1,3>dioxin>-7'a-carboxylic acid phenylmethyl ester   、                                                                                             <5R,5(1R),2'S,4'aR,7'R,7'aS>-Dihydro-5--2,2-dimethyl-6'-oxo-2'-phenyl-spiro<1,3-dioxolane-4,7'(6'H)-<7aH>furo<3,2-d><1,3>dioxin>-7'a-carboxylic acid phenylmethyl ester