Synthesis of a Novel Type of 2,3'-BIMs via Platinum-Catalysed Reaction of Indolylallenes with Indoles

Cooper, Lisa, Alonso, José Miguel, Eagling, Louise, Newson, Helen, Herath, Sachini, Thomson, Christopher, Lister, Andrew, Howsham, Catherine, Cox, Brian and Paz Muñoz, María (2018) Synthesis of a Novel Type of 2,3'-BIMs via Platinum-Catalysed Reaction of Indolylallenes with Indoles. Chemistry - A European Journal, 24 (23). pp. 6105-6114. ISSN 0947-6539

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Abstract

Optimisation, scope and mechanism of the platinum-catalysed addition of indoles to indolylallenes is reported here to give 2,3'-BIMs with a novel core structure very relevant for pharmaceutical industry. The reaction is modulated by the electronic properties of the substituents on both indoles, with the 2,3'-BIMs favoured when electron donating groups are present. Although simple at first, a complex mechanism has been uncovered that explains the different behaviour of these systems with platinum when compared with other metals (e.g. gold). Detailed labelling studies have shown Pt-catalysed 6-endo-trig cyclisation of the indollylallene as the first step of the reaction and the involvement of two cyclic vinyl-platinum intermediates in equilibrium through a platinum carbene, as the key intermediates of the catalytic cycle towards the second nucleophilic attack and formation of the BIMs.

Item Type: Article
Uncontrolled Keywords: platinum,allene,indole,bisindolylmethane,mechanism
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Pure Connector
Date Deposited: 02 Feb 2018 15:30
Last Modified: 22 Apr 2020 06:12
URI: https://ueaeprints.uea.ac.uk/id/eprint/66212
DOI: 10.1002/chem.201705417

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