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