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Evaluating the viability of successive ring expansion reactions based on amino acid and hydroxyacid side chain insertion

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JournalChemistry : A European Journal
DateAccepted/In press - 20 May 2020
DateE-pub ahead of print (current) - 11 Sep 2020
Number of pages11
Pages (from-to)1-11
Early online date11/09/20
Original languageEnglish

Abstract

The outcome of ring expansion reactions based on amino/hydroxyacid side chain insertion is strongly dependent on ring size. This manuscript, which builds upon our previous work on Successive Ring Expansion (SuRE) methods, details efforts to better define the scope and limitations of these reactions on lactam and β-ketoester ring systems with respect to ring size and additional functionality. The synthetic results provide clear guidelines as to which substrate classes are more likely to be successful and are supported by computational results, using a Density Functional Theory (DFT) approach. Calculating the relative Gibbs free energies of the three isomeric species that are formed reversibly during ring expansion enables the viability of new synthetic reactions to be correctly predicted in most cases. The new synthetic and computational results are expected to support the design of new lactam- and β-ketoester-based ring expansion reactions.

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