(9aS)-8-acetyl-1,7-dihydroxy-3-methoxy-9a-methyl-9-oxo-9,9a-dihydrodibenzo[b,d]furan-4-carboxamide   、                                                                                      
4-(2-butynyloxy)-2-methyl-1-naphthaldehyde   、                                                                                      
三乙基硅烷   、                                                                                      
三氟乙酸                                                                                                                                                                                              以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以to give the target compound (190 mg, yield: 52%) as a yellow solid的产率得到(9aS)-8-acetyl-N-{ [4-(2-butynyloxy)-2-methyl-1-naphthyl]methyl}-1,7-dihydroxy-3-methoxy-9a-methyl-9-oxo-9,9a-dihydrodibenzo[b,d]furan-4-carboxamide