786709-32-8Relevant articles and documents
Asymmetric hetero-Diels-Alder reactions of N-sulfinyl dienophiles using chiral bis(oxazoline)-copper(II) and -zinc(II) triflates
Bayer, Annette,Endeshaw, Molla Mellese,Gautun, Odd R.
, p. 7198 - 7205 (2007/10/03)
Asymmetric hetero-Diels-Alder (HDA) reactions of N-sulfinyl dienophiles using bis(oxazoline)-copper(II) and -zinc(II) triflates are described. The cycloadditions with cyclic and acyclic 1,3-dienes have been studied. In most cases, good enantioselectivitie
Absolute configuration of the polyazamacrolides, macrocyclic polyamines produced by a ladybird beetle
Schroeder, Frank C.,Farmer, Jay J.,Smedley, Scott R.,Eisner, Thomas,Meinwald, Jerrold
, p. 6625 - 6628 (2007/10/03)
The absolute configuration of the polyazamacrolides, oligomeric macrocycles from the pupal defensive secretion of Epilachna borealis, was determined by comparison of derivatives of the natural material with enantiomerically pure synthetic samples. Samples of a mixture of three (ω- 1)-(2-hydroxy-ethylamino)alkanoic acids and of the corresponding aza-lactones were synthesized from (R)-alaninol. Gas chromatographic comparison of MTPA- amides of the synthetic aza-lactones with the MTPA-amides of aza-lactones prepared from the natural material established that the polyazamacrolides have the (R)-configuration at all stereogenic centers.