9-hydroxy-3,3-dimethyl-1,2-dihydro-3H-naphtho[2,1-b]pyran-7,10-dione                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙二醇二甲醚                                                                                  为溶剂,
                                                                                                                                                    反应 70.0h,
                                                                                                                以1.5%的产率得到9-hydroxy-8-(8'-(9''-hydroxy-3'',3''-dimethyl-7'',10''-dioxo-1'',2'',7'',10''-tetrahydro-3''H-naphtho[2,1-b]pyran-8''-yl)-3',3'-dimethyl-7',10'-dioxo-1',2',7',10'-tetrahydro-3'H-naphtho[2,1-b]-pyran-9'-yl)-1,2-dihydro-3,3-dimethyl-3H-naphtho[2,1-b]pyran-7,10-dione