Abstract:
:Ultrasound-assisted synthesis of benzimidazo[2,1-b]quinazolin-1(1H)-ones was achieved via piperidine-catalyzed three-component reaction of 2-aminobenzimidazoles, an aromatic aldehyde, and 1,3-dione in aqueous isopropanol. This mechanism was first suspected following our identification of unusual reaction intermediates in a one-pot reaction. An unprecedented coupling reaction, it involved a nucleophilic attack by 2-aminobenzimidazole on in situ generated Michael adduct, followed by electrocyclic ring formation reaction. In contrast to the commonly accepted mechanism, that the direct reaction of 2-amino benzimidazole with a Knoevenagel adduct cannot deliver target compounds.
journal_name
ACS Comb Scijournal_title
ACS combinatorial scienceauthors
Chen LH,Chung TW,Narhe BD,Sun CMdoi
10.1021/acscombsci.5b00186subject
Has Abstractpub_date
2016-03-14 00:00:00pages
162-9issue
3eissn
2156-8952issn
2156-8944journal_volume
18pub_type
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