1. 2, 3-Disubstituted gamma-Butyrolactams from the Michael-Additions of Doubly Deprotonated, Optically Active beta-Hydroxycarboxylates to Nitroolefins. Preliminary Communication
Max Züger, Thomas Weller, Dieter Seebach
Helvetica Chimica Acta, Volume 63, Issue 7, pages 2005-20096 (29 October 1980)
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http://dx.doi.org/10.1002/hlca.19800630727 Vivek Rauniyar and Dennis G. Hall
J. Org. Chem., 2009, 74 (11), pp 4236–4241
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http://dx.doi.org/10.1021/jo900553f G. Fráter, U. Müller and W. Günther
Tetrahedron
Volume 40, Issue 8, 1984, Pages 1269-1277
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http://dx.doi.org/10.1016/S0040-4020(01)82413-3 Philip Kraft and Werner Tochtermann
Tetrahedron
Volume 51, Issue 40, 2 October 1995, Pages 10875-10882
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http://dx.doi.org/10.1016/0040-4020(95)00664-T