Asymmetric isothiourea-catalysed formal [3+2] cycloadditions of ammonium enolates with oxaziridines

A highly enantioselective Lewis base-catalysed formal [3+2] cycloaddition of ammonium enolates and oxaziridines to give stereodefined oxazolidin-4-ones in high yield is described. Employing an enantioenriched oxaziridine in this process leads to a matched/mis-matched effect with the isothiourea catalyst and allowed the synthesis of either syn- or anti-stereodefined oxazolidin-4-ones in high dr, yield and ee. Additionally, the oxazolidin-4-one products have been derivatised to afford functionalised enantioenriched building blocks.

Citation

Smith , S R , Fallan , C , Taylor , J E , McLennan , R S , Daniels , D S B , Morrill , L C , Slawin , A M Z & Smith , A D 2015 , ' Asymmetric isothiourea-catalysed formal [3+2] cycloadditions of ammonium enolates with oxaziridines ' , Chemistry - A European Journal , vol. 21 , no. 29 , pp. 10530–10536 . https://doi.org/10.1002/chem.201501271

Publication

Chemistry - A European Journal

Status

Peer reviewed

DOI

https://doi.org/10.1002/chem.201501271

ISSN

0947-6539

Type

Journal article

Rights

© 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Description

The authors thank the Royal Society for a University Research Fellowship (A.D.S.) and the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007—2013), ERC Grant Agreement No. 279850 (C.F. and J.E.T.), GSK (CASE award to S.R.S.) and EPSRC grant No. EP/J018139/1 (D.S.B.D.) for funding.