123820-99-5Relevant articles and documents
CHIRAL α,β-UNSATURATED OXAZOLINES IN THE ASYMMETRIC DIELS-ALDER REACTION
Pouilhes, A.,Uriarte, E.,Kouklovsky, C.,Langlois, N.,Langlois, Y,et al.
, p. 1395 - 1398 (1989)
α,β-Unsaturated oxazolines derived from (+)-camphor become powerful dienophiles in asymmetric Diels-Alder reaction after activation with trifluoroacetic anhydride.
A viable route to exo-2-benzyliminobornan-3-ol: A key intermediate in the synthesis of a chiral auxiliary
Morris, David G.,Ryder, Karl S.
, p. 620 - 622 (1997)
A new synthesis of the title compound 2 has been achieved in which benzylamine reacts with the novel hydroxy N-nitroimine 6 with concomitant evolution of nitrous oxide, whereas the published reaction between benzylamine and the corresponding ketone 4 does not occur reproducibly.
Asymmetric Diels-Alder reactions employing modified camphor-derived oxazolidin-2-one chiral auxiliaries
Banks, Malcolm R.,Blake, Alexander J.,Cadogan,Doyle, Allan A.,Gosney, Ian,Hodgson, Philip K. G.,Thorburn, Paul
, p. 4079 - 4094 (2007/10/03)
Transposition of the dormant methyl group from C-1 in chiral oxazolidin-2-one 2 to C-7 in a six step synthetic sequence from (1R)-camphore 5 creates a novel transfigomer 4 with sufficient π-topological bias to induce excellent levels of asymmetric induction in Lewis-acid catalysed Diels-Alder reactions of its α, β-unsaturated carboximide derivatives with cyclopentadiene. Further modification of 4 by replacement of the C-7 methyl group with an ethyl substituent raises the level of diastereoselectivity for the acrylate derivative 11a from 81 to > 95% d.e..
α,β-unsaturated oxazolines, a powerful tool in asymmetric diels-alder cycloadditions
Kouklovsky, Cvrille,Pouilhès, Annie,Langlois, Yves
, p. 6672 - 6679 (2007/10/02)
α,β-Unsaturated oxazolines 10, 12, and 16, activated with trifluoroacetic anhydride, proved to be very powerful dienophiles toward various dienes such as 17-23 including Danishefsky type diene. The reactions were performed generally between -100 and -20 °C and the diastereoselectivity is usually better than 90%.