A Palladium-Catalyzed Approach to Polycyclic Sulfur Heterocycles
摘要:
The synthesis of a variety of polycyclic thiophenes and benzothiophenes is accomplished via a palladium-catalyzed domino ortho-alkylation/direct arylation reaction. An examination of the intramolecular direct arylation of thiophenes suggests that an electrophilic metalation mechanism may be present. This method was further extended to include the synthesis of a (thieno)benzoxepine.
Direct α‐functionalization of NH2‐free glycinates with relatively weak electrophiles such as α,β‐unsaturatedesters still remains a big challenge in organic synthesis. With chiral pyridoxal 5 d as a carbonyl catalyst, direct asymmetricconjugated addition at the α‐C of glycinate 1 a with α,β‐unsaturatedesters 2 has been successfully realized, to produce various chiral pyroglutamic acid esters 4 in 14–96 %
作者:Guanlei Xie、Prinessa Chellan、Jincheng Mao、Kelly Chibale、Gregory S. Smith
DOI:10.1002/adsc.201000218
日期:——
thiosemicarbazone salicylaldiminato‐palladium(II) complexes of the general formula [Pd(saltsc‐R)PPh3] [saltsc=salicylaldehyde thiosemicarbazone; R=H (1), 3‐tert‐butyl (2), 3‐methoxy (3), 5‐chloro (4)], have been evaluated as catalyst precursors for the Mizoroki–Heck coupling reaction between a variety of electron‐rich and electron‐poor aryl halides and olefins. The palladium complexes (0.1–1 mol% loading) were found
silylamination of α,β-unsaturated esters with silylboranes and hydroxylamines has been developed to afford the corresponding β-silyl-α-amino acidderivatives, which are of great interest in medicinal and pharmaceutical chemistry. Additionally, by using a suitable chiral bisphosphine ligand, the asymmetricinduction is possible, delivering the optically active β-silyl-α-amino acids with synthetically
[EN] TARGETING GLI PROTEINS IN HUMAN CANCER BY SMALL MOLECULES<br/>[FR] CIBLAGE DE PROTÉINES GLI DANS UN CANCER HUMAIN PAR DES PETITES MOLÉCULES
申请人:UNIV CALIFORNIA
公开号:WO2013013190A1
公开(公告)日:2013-01-24
The present disclosure provides compositions, pharmaceutical preparations and methods for the diagnosis and treatment of cancers expressing a GLI polypeptide. The disclosed compositions and pharmaceutical preparations may comprise one or more pyrazolyl-containing compounds, or an analog or derivative thereof.
Cyclopentyl modulators of chemokine receptor activity
申请人:Merck & Co., Inc.
公开号:US06500844B1
公开(公告)日:2002-12-31
The present invention is directed to compounds of the formula I:
(wherein R1, R2, R3, R7, R8, X, Y, Z, x and y are defined herein) which are useful as modulators of chemokine receptor activity. In particular, these compounds are useful as modulators of the chemokine receptors CCR-5 and/or CCR-3.