New Pyridone Approach: Total Synthesis of Mappicine Ketone (Nothapodytine B)
作者:Khalid Mekouar、Yves Génisson、Stefanie Leue、Andrew E. Greene
DOI:10.1021/jo0003448
日期:2000.8.1
A novel synthesis of mappicineketone, which possesses strong selective activity against the herpes viruses HSV-1 and HSV-2, including those Acyclovir-resistant, and human cytomegalovirus (HCMV) has been efficiently accomplished. The synthesis highlights a new pyridone approach that effectively combines a double, intramolecular Michael addition in a conjugated ester-conjugated amide with oxidation-decarboxylation
Enantioselective Synthesis of α,β-Disubstituted-β-amino Acids
作者:Mukund P. Sibi、Prabagaran Narayanasamy、Sandeep G. Ghorpade、Craig P. Jasperse
DOI:10.1021/ja0372309
日期:2003.10.1
Highly diastereoselective and enantioselective addition of N-benzylhydroxylamine to imides 17 and 20-30 produces alpha,beta-trans-disubstituted N-benzylisoxazolidinones 19 and 31-41. These reactions proceed in 60-96% ee with 93-99% de's using 5 mol % of Mg(NTf2)2 and ligand 18. The product isoxazolidinones can be hydrogenolyzed directly to provide alpha,beta-disubstituted-beta-amino acids.
Highly Enantioselective Construction of the α-Chiral Center of Amides<i>via</i>Iridium-Catalyzed Hydrogenation of α,β-Unsaturated Amides
作者:Wei-Jing Lu、Xue-Long Hou
DOI:10.1002/adsc.200900080
日期:2009.6
Abstractmagnified imageThe chiral center at the α‐position of amides is installed in excellent enantioselectivity via the iridium‐catalyzed asymmetric hydrogenation of α,β‐unsaturated amides under mild conditions. Even aliphatic amides are suitable substrates. The presence of a hydrogen atom on the nitrogen of the amide is important for the enantioselectivity of the reaction.
COREY, PAUL F., TETRAHEDRON LETT., 28,(1987) N 25, 2801-2804
作者:COREY, PAUL F.
DOI:——
日期:——
Two stage polymerization of vinyl acetate/ethylene emulsion copolymers containing incompatible monomers