8-(3,4-Dimethoxyphenyl)-5-methoxy-2,2-dimethyl-3,4-dihydropyrano[2,3-f]chromen-10-one 在
sodium hydrogen telluride 作用下,
以
乙醇 为溶剂,
反应 15.0h,
以38%的产率得到1,3-Propanedione,1-(3,4-dihydro-7-hydroxy-5-methoxy-2,2-dimethyl-2H-1-benzopyran-8-yl)-3-(3,4-dimethoxyphenyl)-