addition by the coordination or non-coordination of proton or lithiumcation to the carbonyls. To clarify the origin of the regioselectivity, the relative rates of the conjugate addition of thiol to acrylate derivatives were measured under competitive conditions. Ethyl acrylate reacted with thiol faster than tert-butyl acrylate and the rate difference was enhanced by the presence of lithiumcation. In the
The regiochemistry of the Michael addition of thiols to tertiary fumaric amide esters was efficiently controlled in the presence or absence of base; either of the two isomers was prepared in a highly selective way.
Palasz, Peter D.; Utley, James H. P.; Hardstone, J. David, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1984, vol. 38, # 4, p. 281 - 292
作者:Palasz, Peter D.、Utley, James H. P.、Hardstone, J. David
DOI:——
日期:——
Aza-peptidyl Michael Acceptors. A New Class of Potent and Selective Inhibitors of Asparaginyl Endopeptidases (Legumains) from Evolutionarily Diverse Pathogens
作者:Marion G. Götz、Karen Ellis James、Elizabeth Hansell、Jan Dvořák、Amritha Seshaadri、Daniel Sojka、Petr Kopáček、James H. McKerrow、Conor R. Caffrey、James C. Powers
DOI:10.1021/jm701311r
日期:2008.5.1
results suggest an evolutionary constraint on the topography of the prime side of the activesite. SAR also revealed that esters in the P1' position are more potent than disubstituted amides and that monosubstituted amides and alkyl derivatives show little or no inhibition. The preferred P1' residues have aromatic substituents. Aza-asparaginyl Michael acceptors react with thiols, which provides insight