Oxalic acid catalyzed solvent-free one pot synthesis of coumarins

Oxalic acid was found to be an efficient catalyst for Pechmann condensation, which includes the reaction between phenols and β-keto esters leading to formation of coumarin derivatives. The advantages of present methods are the use of cheap and easy available catalyst, solvent-free reaction conditions, better yields and shorter reaction time.

不对称草酸酯类香料的合成

本文主要介绍几种具有发香、定香双重作用的新型香料的合成方法。这些香料都是以草酸二乙酯与相应的醇为原料,通过酯交换反应来合成的。