4- Preparation method of 4-substituted coumarin derivative under iron catalyst and basic additives

摘要

The present invention relates to a process for preparing a 4-substituted coumarin derivative using an iron catalyst and a base additive, wherein a 4-substituted coumarin sulfamate is used as a starting material, Substituted coumarin derivatives having a functional group in a short time in a high yield while minimizing the production of byproducts.