Mapping the Mechanism of Nickel-Ferrophite Catalysed Methylation of Baylis-Hillman-Derived S<sub>N</sub>2′ Electrophiles
作者:Andrew Novak、Maria José Calhorda、Paulo Jorge Costa、Simon Woodward
DOI:10.1002/ejoc.200801029
日期:2009.2
presence of ferrophite ligands has been investigated computationally and experimentally. The sense and degree of enantioselectivity attained is independent of both the leaving group and the isomeric structure of the initial allylic halide. DFT studies support the selective formation of a limited number of energetically favoured anti and syn π-allyl intermediates. The observed regio- and enantioselectivity
N-[Mercaptoacyl (amino acid or peptide ) ] compounds and S-lipophiIic
申请人:Institut National de la Sante et de la Recherche Medicale (INSERM)
公开号:US05591891A1
公开(公告)日:1997-01-07
N-[Mercaptoacyl(amino acid or peptide)] compounds and S-lipophilic aliphatic carbonyl derivatives thereof, and pharmaceutical compositions comprising such compounds, as well as the use of these compounds as antihypertensives by the inhibition of neutral endopeptidase and/or peptidyldipeptidase A are disclosed. Methods for preparing the such compounds and derivatives are disclosed also.
AN INTERPRETATION OF THE SUBSTITUENT EFFECT IN THE BLAISE REARRANGEMENT IN TERMS OF PI-ORBITALS
作者:Yukio Abe、Tadashi Suehiro
DOI:10.1246/cl.1983.389
日期:1983.3.5
The migratory aptitude of the substituent groups in the Blaise rearrangement can be explained in terms of the pi-electronic properties of the groups in the highest occupied molecular orbitals. The rates of the rearrangement reaction with relation to the substituent groups were also rationally understood based on the energy levels of the molecular orbitals.
Blaise 重排中取代基的迁移能力可以用最高占据分子轨道中基团的 pi 电子特性来解释。基于分子轨道的能级,也可以合理地理解与取代基相关的重排反应速率。
N-(mercaptoacyl)amino acids, methods of their preparation and therapeutic use, and pharmaceutical compositions containing them
申请人:INSTITUT NATIONAL DE LA SANTE ET DE LA
RECHERCHE MEDICALE (INSERM)
公开号:EP0539848A1
公开(公告)日:1993-05-05
The present invention is directed to a compound of the formula (I)
wherein
R represents a hydrogen atom or an acyl, aroyl or cycloalkylcarbonyl radical or a residue of formula
R₁ represents an alkyl radical;
R₂ represents an aryl or heteroaryl radical, or R₁ represents an alkylene chain attached to a carbon atom in an ortho position of the R₂ aryl or heteroaryl radical relative to a carbon of the R₂ aryl or heteroaryl radical linked to the propanoyl moiety;
R₃ represents a hydrogen atom or an alkyl, aryl, alkoxy or aryloxy radical; and
R' represents a hydrogen atom or an alkyl, aralkyl, acyl or aroyl radical;
and the pharmaceutically acceptable salts thereof.
The invention is also directed to the preparation of these compounds, pharmaceutical compositions comprising the compounds and methods for their pharmaceutical use.
FORMATION OF CYCLOPROPANE DERIVATIVES IN THE BLAISE REARRANGEMENT
作者:Yukio Abe、Tadashi Suehiro
DOI:10.1246/cl.1982.337
日期:1982.3.5
On heating tosylates of ethyl 2-alkyl-2-methyl-3-hydroxy-3-phenylpropanoate (R=Me, 1b; R=Et, 6) in o-dichlorobenzene at 170 °C, ethyl 1-methyl-2-phenyl- and 1,2-dimethyl-3-phenylcyclopropanecarboxylates, 3, and 8, were formed in both 5% yield, respectively, whereas the alkyl migration products, ethyl 3-alkyl-2-methyl-3-phenylpropenoates, were not produced. The mode of the reaction of the methyl group