Asymmetric isothiourea-catalysed formal [3+2] cycloadditions of ammonium enolates with oxaziridines
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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.
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 . DOI: 10.1002/chem.201501271
Chemistry - A European Journal
© 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.
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.
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