Stereospecific Friedel-Crafts alkylation of aromatic compounds: synthesis of optically active 2- and 3-arylalkanoic esters
摘要:
The alkylation of aromatic compounds, such as benzene, toluene, chlorobenzene, and naphthalene, with optically active (S)-alkyl 2-(sulfonyloxy)propionates and (R)-alkyl 3-(sulfonyloxy)butanoates in the presence of AlCl3 afforded optically active (S)-alkyl 2-arylpropionates and (S)-alkyl 3-arylbutanoates in fair to good chemical yields (40-84%) and in good to excellent optical yields (61-97%). As usually occurs in Friedel-Crafts alkylation reactions, poor regioselectivity was observed.
The synthesis and reduction of optically active 2-mercaptopropionic acid and some derivatives
作者:L. N. Owen、M. B. Rahman
DOI:10.1039/j39710002432
日期:——
toluene-α-thiolate, on methyl L-O-ptolysulphonyl-lactate, methyl L-2-chloropropionate, and sodium L-2-chloropropionate, have been used to prepare D-2-acylthio- and D-2-acylthio- and D-2-alkylthio-propionic acids and esters. Extensive racemisation occurs when an excess of thioacetate or thiobenzoate is used; this is attributed to further SN2 displacement, with acetylthio or benzoylthio as a leaving group. Concomitant
[EN] 1-PHENYL-SUBSTITUTED HETEROCYCLYL DERIVATIVES AND THEIR USE AS PROSTAGLANDIN D2 RECEPTOR MODULATORS<br/>[FR] DÉRIVÉS HÉTÉROCYCLYLÉS 1-PHÉNYL-SUBSTITUÉS ET LEUR UTILISATION EN TANT QUE MODULATEURS DU RÉCEPTEUR DE LA PROSTAGLANDINE D2
申请人:ACTELION PHARMACEUTICALS LTD
公开号:WO2014006585A1
公开(公告)日:2014-01-09
The present invention relates to 1-phenyl-substituted heterocyclyl derivatives of the formula (I), wherein Y, Z, R1, R2, R3 and R4 are as described in the description and their use as prostaglandin receptor modulators, most particularly as prostaglandin D2 receptor modulators, in the treatment of various prostaglandin-mediated diseases and disorders, to pharmaceutical compositions containing these compounds and to processes for their preparation.
Synthesis of dendrimer-type chiral stationary phases based on the selector of (1<i>S</i>,2<i>R</i>)-(+)-2-Amino-1,2-diphenylethanol derivate and their enantioseparation evaluation by HPLC
作者:Bao-Jiang He、Chuan-Qi Yin、Shi-Rong Li、Zheng-Wu Bai
DOI:10.1002/chir.20708
日期:2010.1
a series of dendritic chiralstationaryphases (CSPs) were synthesized, in which the chiralselector was L‐2‐(p‐toluenesulfonamido)‐3‐phenylpropionyl chloride (selector I), and the CSP derivedfrom three‐generation dendrimer showed the best separation ability. To further investigate the influence of the structures of dendrimer and chiralselector on enantioseparationability, in this work, another