Most of the synthetic chemical transformation reactions involve the use of different organic
solvents. Unfortunately, some of these toxic solvents are used in chemical laboratory …

This review gives an overview of utilization of ultrasound for the synthesis of various
heterocyclic compounds. Ultrasonic irradiation has been considered as an efficient …

SelectfluorTM F-TEDA-BF4 (1-chloromethyl-4-fluoro-1, 4-diazoniabicyclo [. 2.2] octane bis
(tetrafluoroborate) is not only one of the most efficient and popular reagents for electrophilic …

We wish to report a mild and efficient one-pot three component reaction of an aryl aldehyde,
malononitrile and barbituric acid or 4-hydroxycoumarin for the synthesis of pyrano [2, 3-d] …

Considering highly important biological and medicinal properties of chromenes, synthesis of
these heterocycles has attracted the interest of medicinal and organic chemists. This review …

p-Dodecylbenzenesulfonic acid (DBSA) was used as a catalyst for a simple and efficient one-
pot synthesis of aryl substititued tetrahydrobenzo [b] pyrans and dihydropyrano [c] chromens …

The Pechmann condensation is the formation of coumarin derivatives from phenols and a
carboxylic acids or esters containing a β-carbonyl group under acidic conditions. The …

In the present era of the industrial revolution, we all are familiar with ever-increasing
environmental pollution released from various chemical processes. Chemical production …

The preparation of substituted 2-amino-4H-chromenes by a Na2CO3-catalyzed reaction of
malononitrile, benzaldehydes, and phloroglucinol or resorcinol in aqueous medium and at …

This article presents a simple and practical method for the synthesis of 3, 4-dihydropyrano [c]
chromene, which are heterocyclic compounds possessing a wide range of biological …