Asymmetric ammonium ylid rearrangements: the effect of nitrogen asymmetryTools  Sweeney, J.B., Tavassoli, A. and Workman, J.A. (2006) Asymmetric ammonium ylid rearrangements: the effect of nitrogen asymmetry. Tetrahedron, 62 (49). pp. 11506-11512. ISSN 0040-4020 Full text not archived in this repository. To link to this article DOI: 10.1016/j.tet.2006.06.043 Abstract/Summary[2,3]-Sigmatropic rearrangements of allylic ammonium ylids derived from glycinoylcamphorsultams are highly selective in terms of relative and absolute stereocontrol only when acyclic alkenes are present. When chiral esters of ylids derived from N-methyltetrahydro-pyridine ('NMTP') undergo rearrangement, the reactions show exclusive cis-stereoselectivity but the products are obtained with virtually no absolute stereocontrol. These observations support the notion that sigmatropic rearrangements of N-chiral ammonium ylids are controlled by nitrogen stereogenicity. (c) 2006 Elsevier Ltd. All rights reserved.
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