Pseudo Multicomponent Reaction: Synthesis of Fused Pyrano Biscoumarin Analogs from 1,2‐diols

Abstract

A simple and efficient method has been developed for the synthesis of fused pyrano biscoumarins using lead tetraacetate as an oxidizing agent by the condensation of one equivalent of 1,2‐diols and four equivalent of 4‐hydroxy coumarin in acetonitrile as solvent at 80°C with good to excellent yields.

Zinc chloride catalyzed multicomponent synthesis of pyrazolopyridocoumarin scaffolds

“…Based on the literature survey and in continuation with our ongoing research work on the preparation of biologically active heterocycles, [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] we desire to report a novel method for synthesis of pyrazolopyridocoumarins from simple and readily available starting materials, which went through the simultaneous construction of pyrazole and pyridine rings.…”

Visible Light‐Induced Synthesis of Biscoumarin Analogs under Catalyst‐Free Conditions

“…Many synthetic approaches have been reported for the synthesis of biscoumarins . The most important protocols are from (i) benzylic alcohols and 4‐hydroxycoumarin , (ii) 1,2‐diols and 4‐hydroxycoumarin , and (iii) benzaldehydes and 4‐hydroxycoumarin . The last method is of particular interest, and much development has been progressed.…”

DABCO‐modified super‐paramagnetic nanoparticles as an efficient and water‐compatible catalyst for the synthesis of pyrano[3,2‐c:5,6‐c']dichromene‐6,8‐dione derivatives under mild reaction conditions

“…Due to the wide applications and various activities of pyranochromene derivatives, several efforts have been focused on the synthesis of these compounds. The most efficient synthetic routes contain the reaction of 4‐hydroxycoumarine with hydrobenzoin or aldehyde derivatives . The reaction of 4‐hydroxycoumarine with mandelic acid in acidic conditions was also shown to lead to the pyranochromene derivatives .…”

“…The reaction of 4‐hydroxycoumarine with mandelic acid in acidic conditions was also shown to lead to the pyranochromene derivatives . Regarding the importance of pyrano[3,2‐ c :5,6‐ c ']dichromene‐6,8‐dione derivatives in various biological applications, the synthesis of this class of compounds is of high interest …”