Method for producing benzopyranone compound and novel intermediate used therein
AssigneeILAb
InventorSuk Ho Lee
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Abstract
The present invention relates to a method for preparing 2-(2,5-difluorophenyl)-3-carboxy-7-chloro-(4H)-4-benzopyranone represented by formula 1 below, a novel intermediate used therein, and a method for preparing the same. Specifically, an object of the present invention is to provide a novel preparation method, in which the compound of formula 1 below can be efficiently and economically synthesized and can be mass-produced in a high yield.
Claims16
A compound of formula 2 below:
A compound of formula 3 below:
A method for preparing a form IV crystal of a compound of formula 1, comprising adding the compound of formula 1 below to methyl isobutyl ketone (MIBK) to obtain the form IV crystal of the compound of formula 1
- wherein the form IV crystal exhibits characteristic peaks at four or more diffraction angles 2θ±0.2° selected from the group consisting of 11.3, 14.7, 14.9, 16.9, 17.2, 22.5, and 25.7.
Dependencies are inferred from the claim text.