Transforming how plastics are made, unmade, and remade through innovative research and
diverse partnerships that together foster environmental stewardship is critically important to …

2H/4H-chromene (2H/4H-ch) is an important class of heterocyclic compounds with versatile
biological profiles, a simple structure, and mild adverse effects. Researchers discovered …

1. INTRODUCTION Bicyclic oxygen heterocycles resulting from fusion of benzene ring with
5, 6-positions of either 2H-or 4H-pyran ring system are designated as 2H-chromene (2H-1 …

Selenium-based catalysts, due to their high efficiency, mild reaction conditions, good
functional compatibility and excellent selectivity, have attracted much attention during the …

A simple, straightforward, and highly efficient multicomponent one-pot synthesis of a
pharmaceutically interesting diverse kind of functionalized 2-amino-3-cyano-4 H-pyrans and …

Ketene dithioacetals are versatile intermediates in organic synthesis. Extensive research,
since the last decade, has given rise to new prospects in their chemistry. The objective of …

Abstract 4H-Pyrans and 4H-pyran-annulated heterocyclic scaffolds represent a “privileged”
structural motif well-distributed in biologically active natural products and also in promising …

Pyrones and 4‐pyrones are common structural motifs in bioactive natural products.
However, traditional methods for their synthesis, which try to emulate the biosynthetic …

We have described solvent-free preparation of new pyrano [2, 3-c]-pyrazole-5-carbonitriles
(1-10) from the reaction of 1, 3-diketo ester, aryl hydrazine, aromatic aldehyde, and …

Covering: 1998 to July 2010 Since 1998, a great number of bufadienolides have been
reported from plants, animals and plant cell suspensions, as well as from fungi and bacteria …