Andreou, Dimitrios, Kallitsakis, Michael G, Loukopoulos, Edward, Gabriel, Catherine, Kostakis, George E and Lykakis, Ioannis N (2018) Copper-promoted regioselective synthesis of polysubstituted pyrroles from aldehydes, amines and nitroalkenes via1,2-phenyl/alkyl migration. Journal of Organic Chemistry, 83 (4). pp. 2104-2113. ISSN 0022-3263
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Abstract
The facile Copper-catalyzed synthesis of polysubstituted pyrroles from aldehydes, amines and β-nitroalkenesis reported. Remarkably, the use of α-methyl substituted aldehydes provide efficient access to a series of tetra- and pentasubstituted pyrroles via an overwhelming 1,2-phenyl/alkyl migration. The present methodology is also accessible to non α-substituted aldehydes yielding the corresponding trisubstituted pyrroles. On the contrary, the use of ketones, in place of aldehydes, does not promote the organic transformation signifying the necessity of α-substituted aldehydes. The reaction proceeds under mild catalytic conditions with low catalyst loading (0.3 – 1 mol %), a broad scope, very good functional-group tolerance, high yields and can be easily scaled up to more than 3 mmol of product, thus highlighting a useful synthetic application of the present catalytic protocol. Based on formal kinetic studies, a possible radical pathway is proposed that involves the formation of an allylic nitrogen radical intermediate, which in turn reacts with the nitroalkene to yield the desired pyrrole framework via a radical 1,2-phenyl or alkyl migration.
Item Type: | Article |
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Schools and Departments: | School of Life Sciences > Chemistry |
Research Centres and Groups: | Centre for Byzantine Cultural History |
Subjects: | Q Science > QD Chemistry > QD0146 Inorganic chemistry |
Depositing User: | Georgios Kostakis |
Date Deposited: | 22 Jan 2018 17:18 |
Last Modified: | 02 Jul 2019 13:18 |
URI: | http://sro.sussex.ac.uk/id/eprint/73055 |
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