7-Hydroxy-8-methyl-2-oxo-5-pentyl-2H-chromene-3-carboxylic acid benzyl ester 在
palladium on activated charcoal
氢气 、
三苯基膦 、
偶氮二甲酸二乙酯 作用下,
以
四氢呋喃 、
二氯甲烷 为溶剂,
生成 5-Methyl-1H-pyrrole-2-carboxylic acid (3R,4S,5R,6R)-6-(3-carboxy-8-methyl-2-oxo-5-pentyl-2H-chromen-7-yloxy)-5-hydroxy-3-methoxy-2,2-dimethyl-tetrahydro-pyran-4-yl ester