(2S,6R)-6-methyl-5-oxo-5,6-dihydro-2H-pyran-2-yl acetate 、
(2S,6'R)-7-chloro-2'-hydroxy-4,6-dimethoxy-6'-methyl-3H-spiro[benzofuran-2,1'-cyclohexan]-2'-ene-3,4'-dione 在
四(三苯基膦)钯 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 1.0h,
以67%的产率得到(2S,2'R,4a'S,7'R,9b'S)-7-chloro-4,6-dimethoxy-2',7'-dimethyl-4a',7',8',9b'-tetrahydro-2'H,3H,9'H-spiro[benzofuran-2,6'-pyrano[3,2-b]benzofuran]-3,3',9'(4'H)-trione