The chroman-4-one framework is a significant structural entity that belongs to the class of
oxygen-containing heterocycles. It acts as a major building block in a large class of …

Spiro derivatives are important scaffolding substances found in many natural products and
pharmaceuticals. In the last decade, numerous new approaches based on multicomponent …

Piperine is a phytobiotic and a polyphenol-derived alkaloid compound extracted from the
pepper. We evaluated the effects of dietary piperine on growth, feed utilization, innate …

Nitrogen‐containing benzimidazole, piperazine, and piperidine are significant
pharmacophores in medicinal chemistry and drug development. Many medications, lead …

Herein, we report a chemo‐and regioselective Rh‐catalyzed redox C7‐spiroannulation
reaction of N‐benzo [d] imidazole indolines with maleimides, resulting in a series of N …

Herein, we have developed a strategy of sequential C–H activations of indole to construct
novel 2-alkynyl aza-spiro [4, 5] indole scaffolds, which incorporated both alkyne and spiro …

A series of novel spiro‐[chromane‐2, 4′‐piperidin]‐4 (3H)‐one derivatives were designed,
synthesized and structures were confirmed by analytical methods, viz., 1H‐NMR, 13C‐NMR …

Abstract Reactions of dialkoxy-2-phenylchroman-4-ones (2, 3-diethoxy-3-hydroxy-2-
phenylchroman-4-one (1) and 2, 3-dimethoxy-3-hydroxy-2-phenylchroman-4-one (2)) with …

The chroman-4-one skeleton is a remarkable structural system that belongs to oxygen-
containing heterocycles. It constitutes a major building block in a large class of medicinal …

This paper presents the successful implementation of Beckmann rearrangement on a series
of (spiro) pyranocoumarin oximes in polyphosphoric acid (PPA) medium. The method …