A modified and green methodology for preparation of polysubstituted furans

Synthesis of Novel 1H‐Imidazol[1,2‐a]Indeno[2,1‐e]Pyridine‐6(5H)‐Ones Derivatives via a One‐Pot Four‐Component Condensation Reaction

“…In the context of our ongoing studies on heterocyclic construction [12][13][14], MCRs [15,16], and as a continuation of our previous work on the synthesis of some indenoquinoxaline [17,18], indeno imidazole [19], indeno quinolone [20], herein, we wish to report a novel, efficient, and one-pot four-component reaction for the synthesis of 1H-imidazo[1,2-a]indeno[2,1-e]pyridine-6(5H)-ones derivatives in the presence of alum (KAl(SO 4 ) 2 ·12H 2 O) [21,22] as heterogeneous catalyst.…”

Influence of steric hindrance on the 1,4- versus 1,6-Michael addition: synthesis of furans and pentasubstituted benzenes

“…The insertion of a substituent at the C-2 or C-5 position of furans is relatively easy as compared to that at the C-3 position. 13…”