tert-Butyl 4-carbamimidoylpiperidine-1-carboxylate hydrochloride   、                                                                                      methyl 8b-hydroxy-6,8-dimethoxy-3a-(4-methoxyphenyl)-3-phenyl-1-(tosyloxy)-3a,8b-dihydro-3H-cyclopenta[b]benzofuran-2-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 sodium hydride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                                                        以67%的产率得到methyl (±)-(3aR,4R,5S,5aR,10bR)-2-(1-(tert-butoxycarbonyl)piperidin-4-yl)-3a-hydroxy-8,10-dimethoxy-5a-(4-methoxyphenyl)-5-phenyl-3a,4,5,5a-tetrahydro-1H-benzofuro[3',2':1,5]cyclopenta[1,2-d]imidazole-4-carboxylate