126983-40-2Relevant articles and documents
N-SUBSTITUTED HYDROXYSUCCINIMIDES FROM (S)-MALIC ACID AS NEW REAGENTS FOR ASYMMETRIC DIELS-ALDER ADDITION TO ENOATES
Poll, T.,Hady, A. F. Abdel,Karge, R.,Linz, G.,Weetman, J.,Helmchen, G.
, p. 5595 - 5598 (1989)
(S)-N-Methyl-2-hydroxysuccinimide, easily available from natural (S)-malic acid, supplements the previously introduced (R)-pantolactone as chiral auxiliary for asymmetric Diels-Alder reactions of enoates, but yields products of opposite configuration.Practical large-scale preparations of enantiomer pairs of synthetically important Diels-Alder adducts, including adducts from crotonates, are described.
ASYMMETRIC DIELS-ALDER REACTIONS: EPC-SYNTHESIS OF A STABLE SARKOMYCIN PRECURSOR (CYCLOSARKOMYCIN)
Linz, Guenter,Weetman, John,Hady, A. F. Abdel,Helmchen, Guenter
, p. 5599 - 5602 (2007/10/02)
The first synthesis of enantiomerically pure cyclosarkomycin, a stable, crystaline precursor of the antitumor agent sarkomycin is reported.Key steps are an asymmetric Diels-Alder reaction of the (E)-3-bromoacrylate of (R)-pantolactone and introduction of oxygen funtionality via elimination/β-addition.The synthesis of cyclosarkomycin was accomplished in 9 steps in 17 percent overall yield.