Abstract The chemoselectivity in the reaction of 2-diazo-3-oxo-3-phenylpropanal (1) with aldehydes and ketones in the presence of Et 3 N was investigated. The results indicate that 1 reacts with aromatic aldehydes with weak electron-donating substituents and cyclic
![3-[hydroxy(phenyl)methylidene]-6-phenylpyran-2,4-dione结构式](https://image.chemsrc.com/caspic/037/14895-21-7.png)
