The Synthesis of Structurally Diverse Macrocycles By Successive Ring Expansion. 2015

Christiana Kitsiou, and Jordan J Hindes, and Phillip I'Anson, and Paula Jackson, and Thomas C Wilson, and Eleanor K Daly, and Hannah R Felstead, and Peter Hearnshaw, and William P Unsworth
University of York, York, YO24 4PP (UK).

Structurally diverse macrocycles and medium-sized rings (9-24 membered scaffolds, 22 examples) can be generated through a telescoped acylation/ring-expansion sequence, leading to the insertion of linear fragments into cyclic β-ketoesters without performing a discrete macrocyclization step. The key β-ketoester motif is regenerated in the ring-expanded product, meaning that the same sequence of steps can then be repeated (in theory indefinitely) with other linear fragments, allowing macrocycles with precise substitution patterns to be "grown" from smaller rings using the successive ring-expansion (SuRE) method.

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