1,4,4a,9a-tetrahydro-9,10-dioxo-1,4-methanoanthracene-11-spiro-1'-cyclopentane 以
苯 为溶剂,
以68%的产率得到(2'R,2a'S,2a1'S,4'R,4a'R,4b'R,8a'S,10'S)-2a',2a1',4',4a'-tetrahydrospiro[cyclopentane-1,3'-[2,4,4b](epiethane[1,1,2]triyl)benzo[1,4]cyclobuta[1,2,3-cd]pentalene]-1',9'(2'H)-dione