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β‐Enaminone Synthesis from 1,3‐Dicarbonyl Compounds and Aliphatic and Aromatic Amines Catalyzed by Iron Complexes of Fused Bicyclic Imidazo[1,5‐ a ]pyridine Derived N‐Heterocyclic Carbenes
Author(s) -
Prakasham A. P.,
Gangwar Manoj Kumar,
Ghosh Prasenjit
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800906
Subject(s) - chemistry , adduct , pyridine , carbene , medicinal chemistry , catalysis , metathesis , bicyclic molecule , stereochemistry , organic chemistry , polymer , polymerization
A series of Fe–NHC complexes ( 1 – 2 ) c of the fused bicyclic imidazo[1,5‐ a ]pyridine framework of the type [CpFe(2‐R‐imidazo[1,5‐ a ]pyridin‐3‐ylidene)(CO) 2 ]BF 4 {R = mesityl ( 1c ), n Pr ( 2c )} successfully carried out the synthesis of β‐enamino ketones ( 3 – 10 ) and ( 17 – 27 ) and β‐enamino esters ( 11 – 16 ) and ( 28 – 36 ) by the condensation of acyclic and cyclic 1,3‐dicarbonyl compounds and various aliphatic and aromatic amines in the presence of light irradiation. Quite significantly, the catalytically relevant substrate adduct species of the type [CpFe(NHC)(acac)] ( 2e ) and the product adduct species of the type [CpFe(NHC)(β ‐ enaminone)] ( 2f ) of the Fe–NHC precatalyst ( 2c ) have been detected by mass spectrometry study. The [CpFe(2‐R‐imidazo[1,5‐ a ]pyridin‐3‐ylidene)(CO) 2 ]BF 4 {R = mesityl ( 1c ), n Pr ( 2c )} complexes were obtained from their respective N –heterocyclic carbene precursors namely, the 2‐R‐imidazo[1,5‐ a ]pyridin‐2‐ium chloride {R = mesityl ( 1a ), n Pr ( 2a )} by the reaction with CpFe(CO) 2 I in the presence of KN(SiMe 3 ) 2 followed by the salt metathesis reaction with AgBF 4 .