A Convenient Method for the Synthesis of Chromeno[4,3-b]pyridines Via Three-component Reaction.

Abstract:

AIM AND OBJECTIVE:The importance of Chromeno[4,3-b]pyridines in bioactive compounds, highlighted the ongoing research on developing novel methods for the construction of this heterocyclic scaffold. Regarding the advantageous features of multi-component reactions in organic synthesis, we will try to synthesize pyridocoumarins through this method. MATERIALS AND METHODS:Chromeno[4,3-b]pyridines were conveniently prepared from a threecomponent condensation reaction between 4-hydroxy coumarin, ammonia and ethyl 2,4-dioxo-4- arylbutanoates in refluxing n-propanol. The synthesized compounds were characterized by NMR, IR and Mass spectroscopy. RESULTS:The reaction proceeded through an in situ formed 4-amino coumarin, affording eight new target compounds in good yields. CONCLUSION:This method introduce a novel approach to ethyl 4-aryl-5-oxo-5H-chromeno[4,3- b]pyridine-2-carboxylate derivatives and allow organic chemists to prepare 4-aminocoumarin in reaction medium.

authors

Nikookar H,Moghimi S,Sayahi MH,Mahdavi M,Ranjbar PR,Firoozpour L,Foroumadi A

doi

10.2174/1386207321666180524110635

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

344-348

issue

5

eissn

1386-2073

issn

1875-5402

pii

CCHTS-EPUB-90658

journal_volume

21

pub_type

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