PEG-SO3H promoted one pot grinding method for the synthesis of 2-amino-4H-chromene-3-carboxylates

Abstract

There is a crucial medical need for the synthesis of 4H-chromene compounds via simple efficient methods. 4H-chromene compounds are stated to have a wide range of medicinal applications such as anti-bacterial, anti-cancer (EPC2407 and MX58151), antimalarial, antifungal, anti-rheumatic and anti-viral properties depending up on the substituents which is present on the heterocyclic compounds. Nowadays multi component protocols shows a better advantages such as better yield, less reaction time and no usage of different solvents for synthesis of biological important heterocyclic compounds over other synthetic approaches. The operational simplicity and applicability of this protocol to various analogues make it an alternative to previous reported methods.Therefore, this work was to prepare a series of 4H-chromene analogues via simple method with short time. Here, we reported the synthesis of 2-amino-4H-chromene-3-carboxylates using green solvent(water) under grinding method by one pot three component reaction of substituted aldehydes, dimedone and cyano acetates. This reaction was catalysed by catalytic amount of PEG-SO3H at room temperature. This catalyst proved the efficient for synthesis of many heterocyclic compounds. This reaction proceeds with very short time i.e. 5 mins. The 2-amino-4H-chromene derivatives (4a-i) was obtained with excellent yields(85-94%).