A bottom up approach towards artificial oxygenases by combining iron coordination complexes and peptides

作者：Cusso Olaf; Giuliano Michael W; Ribas Xavi; Miller Scott J; Costas Miquel

来源：Chemical Science, 2017, 8(5): 3660-3667.

DOI：10.1039/c7sc00099e

Supramolecular systems resulting from the combination of peptides and a chiral iron coordination complex catalyze asymmetric epoxidation with aqueous hydrogen peroxide, providing good to excellent yields and high enantioselectivities in short reaction times. The peptide is shown to play a dual role; the terminal carboxylic acid assists the iron center in the efficient H2O2 activation step, while its b-turn structure is crucial to induce high enantioselectivity in the oxygen delivering step. The high level of stereoselection (84-92% ee) obtained by these supramolecular catalysts in the epoxidation of 1,1'-alkyl orthosubstituted styrenes, a notoriously challenging class of substrates for asymmetric catalysis, is not attainable with any other epoxidation methodology described so far. The current work, combining an iron center ligated to N and O based ligands, and a peptide scaffold that shapes the second coordination sphere, may be seen as a bottom up approach towards the design of artificial oxygenases.

• 出版日期2017-5