Issue 10, 2011

A new rapid multicomponent domino reaction for the formation of functionalized benzo[h]pyrazolo[3,4-b]quinolines

Abstract

A new multicomponent domino reaction for rapid and regioselective synthesis of highly functionalized benzo[h]pyrazolo[3,4-b]quinolines has been established. The reaction can be conducted by using readily available and inexpensive substrates under microwave irradiation within short periods of 10–26 min. Good to excellent chemical yields (61–91%) and complete regioselectivity have been achieved for 22 examples. Tedious work-up procedure can be avoided due to the direct precipitation of products from the reaction solution. The resulting benzoquinolines have been readily converted into quinoxaline-fused benzo[h]isoxazolo[5,4-b]quinoline analogues by treating with benzene-1,2-diamine under microwave irradiation. The structural assignment has been ambiguously confirmed by X-ray analysis. A new mechanism has been proposed for this new multicomponent domino process.

Graphical abstract: A new rapid multicomponent domino reaction for the formation of functionalized benzo[h]pyrazolo[3,4-b]quinolines

Supplementary files

Article information

Article type
Paper
Submitted
06 Jan 2011
Accepted
02 Mar 2011
First published
03 Mar 2011

Org. Biomol. Chem., 2011,9, 3834-3838

A new rapid multicomponent domino reaction for the formation of functionalized benzo[h]pyrazolo[3,4-b]quinolines

B. Jiang, G. Zhang, N. Ma, F. Shi, S. Tu, P. Kaur and G. Li, Org. Biomol. Chem., 2011, 9, 3834 DOI: 10.1039/C1OB05034F

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