methyl 3-[(1R,2S,3aR,8bR)-2-acetyloxy-1-(hydroxymethyl)-2,3,3a,8b-tetrahydro-1H-cyclopenta[b][1]benzofuran-5-yl]propanoate 、
(2-Oxo-3-propoxy-propyl)-phosphonic acid dimethyl ester 生成 methyl 3-[(1S,2R,3aS,8bS)-2-acetyloxy-1-[(E)-3-oxo-4-propoxybut-1-enyl]-2,3,3a,8b-tetrahydro-1H-cyclopenta[b][1]benzofuran-5-yl]propanoate