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Expeditious synthesis of diverse spiro fused quinoxaline derivatives using magnetically separable core–shell CoFe 2 O 4 @SiO 2 ‐SO 3 H nanocatalyst under ultrasonication
Author(s) -
Mandal Subhro,
Hazra Subhenjit,
Sarkar Soumen,
Bodhak Chandan,
Pramanik Animesh
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4702
Subject(s) - quinoxaline , chemistry , yield (engineering) , catalysis , conjugated system , combinatorial chemistry , substrate (aquarium) , condensation , chemical engineering , organic chemistry , polymer , materials science , composite material , oceanography , physics , engineering , thermodynamics , geology
A magnetically separable core–shell CoFe 2 O 4 @SiO 2 ‐SO 3 H nanocatalyst has been successfully exploited as a heterogeneous acid catalyst in the synthesis of diversely substituted biologically important spiro fused pyrrolo/indolo[1,2‐ a ]quinoxaline derivatives through the condensation of N ‐(2‐aminophenyl)pyrroles/indoles and various cyclic conjugated 1,2‐diones in ethanol under ultrasonic irradiation. Room temperature synthesis, short reaction time, wide substrate scope, good to excellent yield of products and use of a magnetically separable and recyclable nanocatalyst make this method attractive and practicable.