Iranfar S, Shiri M, Nosood YL, Keley ZA, Tanbakouchian Z, Amini Z, Al-Harrasi A, Hussain FHS. An efficient and practical approach for the synthesis of indoloquinolines and indolo/pyrroloquinoxalines
via a Cu-catalyzed Ugi-C/Ugi-
N-arylation sequence.
RSC Adv 2024;
14:18271-18276. [PMID:
38854840 PMCID:
PMC11157420 DOI:
10.1039/d4ra03248a]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Accepted: 05/31/2024] [Indexed: 06/11/2024] Open
Abstract
A Cu-catalyzed tandem transformation of Ugi adducts through CH/NH bond functionalization reactions was reported for synthesizing a broad spectrum of indolo/pyrrolo-[1,2-a]quinoxaline-6/4-carboxamide, 7H-indolo[2,3-c]quinoline-6-carboxamide, and 1-(cyclohexylamino)-14H-indolo[2,3-c][1,4]oxazino[4,3-a]quinolin-4(3H)-one derivatives in moderate to excellent yields. In this protocol the Ugi condensation of aromatic aldehydes, anilines, acids, and isocyanides leads to the formation of bis-amides in methanol at room temperature. This approach employed simple reaction conditions, including Ugi product as starting material, CuI, l-proline as a ligand, and cesium carbonate, in DMSO for 8 h. This method demonstrated efficiency in synthesizing fused-nitrogen-containing heterocycles through a convenient pathway.
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