Disclosed herein is a method for preparing a coumarin compound of formula (F), in which R1, R2, and R3 are independently H, C1˜C7 alkoxy, C1˜C7 alkyl, phenoxy, benzyloxy, or a halogen atom; R4 is an alkyl group; and Ar is an optionally substituted aryl group,
the method including: treating a chromene compound having the following formula (E)
with an acid in the presence of water.
A chromene compound of formula (E) and a method for preparing the chromene compound of formula (E) are also disclosed.
本文揭示了一种制备公式(F)的
香豆素化合物的方法,其中R1、R2和R3独立地为H、C1~C7烷氧基、C1~C7烷基、苯氧基、苄氧基或卤素原子;R4是烷基;Ar是可选择取代的芳基,该方法包括:在
水存在下,在酸的存在下处理具有以下公式(E)的色基化合物。本文还揭示了公式(E)的色基化合物及其制备方法。