4,6-Dihydroxy-5-((1E,3Z)-3-hydroxy-4,6,6-tris-methoxycarbonyl-hexa-1,3,5-trienyl)-isophthalic acid dimethyl ester 以
xylene 为溶剂,
反应 3.0h,
以18 mg的产率得到6-[(E)-2-(2,6-Dihydroxy-3,5-bis-methoxycarbonyl-phenyl)-vinyl]-2-oxo-2H-pyran-3,5-dicarboxylic acid dimethyl ester