(4S,4aS,5S,8R,8aR,9aR)-4a,5,6,7,8,8a,9,9a-octahydro-4,8,8a-trihydroxy-9a-methoxy-3,4a,5-trimethylnaphtho[2,3-b]furan-2(4H)one                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
重铬酸吡啶                                                                                                                                  作用下,
                                                                                                                                                                                                                            以50%的产率得到(4aR,5S,8aR,9aR)-4a,6,7,8a,9,9a-hexahydro-8a-hydroxy-9a-methoxy-3,4a,5-trimethylnaphtho[2,3-b]furan-2,4,8(5H)-trione