3-deoxy-20-secoebelin-2-en-20-oic acid lactone 20-(4-methylphenyl) ester                                                                                                                                                              在
                                                                                                                                                                                 
chromium(VI) oxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
溶剂黄146                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以18%的产率得到(1'S,2'S,4'aS,4'bS,8'aS,10'aR)-3',4,4',4'a,4'b,5,5',8,8'a,9',10',10'a-dodecahydro-4'b,8',8',10'a-tetramethyl-5,5'-dioxospiro[furan-3(2H),1'(2'H)-phenanthrene]-2'-carboxylic acid 4-methylphenyl ester