| abstract |
The invention relates to a new method for preparing 5,7-difluorochroman-4-one derivatives. The preparation method of the present invention uses conventionally available reagents and solvents, does not require a separation and purification process, has low industrial cost, no environmental regulation, and can be applied to large-scale industrial production, so it can be used for 5,7-difluorochroman-4 Efficient preparation of ‑ketone derivatives. |