Approaches to Styrenyl Building Blocks for the Synthesis of Polyene Xanthomonadin and its Analogues

Madden, Katrina S., Laroche, Benjamin, David, Sylvain, Batsanov, Andrei S., Thompson, Daniel, Knowles, Jonathan P. and Whiting, Andrew (2018) Approaches to Styrenyl Building Blocks for the Synthesis of Polyene Xanthomonadin and its Analogues. European Journal of Organic Chemistry, 2018 (38). pp. 5312-5322. ISSN 1434-193X

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Official URL: https://doi.org/10.1002/ejoc.201800540

Abstract

A number of aryl building blocks for the synthesis of two xanthomonadin natural product pigments, as well as a related analogue, were accessed using a divergent hydroboration/bromoboration approach from a key alkynyl intermediate. A new approach towards substitution patterns around the ring was adopted following the isolation of an unexpected regioisomer from the bromination reaction. Potential coupling reactions onto these building blocks were explored, with a successful Sonogashira coupling performed on the key alkynyl intermediate, and with the key debrominated styrenyl boronate ester intermediate functionalised both by preliminary Suzuki–Miyaura coupling and by iododeboronation/Heck–Mizoroki coupling. Coupling reactions with brominated styrenyl intermediates proved much more challenging due to the instability of the intermediates to cross-coupling, but some studies have shown promise.

Item Type: Article
Uncontrolled Keywords: polyenes, natural products, stereoselective synthesis, cross-coupling reactions, vinylboronates
Subjects: F100 Chemistry
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Paul Burns
Date Deposited: 22 Feb 2019 16:47
Last Modified: 04 Apr 2019 13:00
URI: http://nrl.northumbria.ac.uk/id/eprint/38206

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