ethyl 6-hydroxy-4-oxo-4H-chromene-2-carboxylate 在
钯 crude material 、
ethyl acetate n-hexane 作用下,
以
溶剂黄146 为溶剂,
反应 17.0h,
以yielded 4.9 g (59%) of pure crystalline racemic-3,4-dihydro-6-hydroxy-2H-1-benzopyran-2-carboxylic acid ethyl ester的产率得到ethyl 6-hydroxychromane-2-carboxylate