Anchored Palladium Complex‐Generated Clusters on Zirconia: Efficiency in Reductive
<i>N</i>
‐Alkylation of Amines with Carbonyl Compounds under Hydrogen Atmosphere
generation method of palladium clusters and catalytic reductive N-alkylation of amines with carbonyl compounds are reported. The active Pd species are formed by treatment of highly dispersed molecular palladiumcomplexes with atmospheric hydrogen, and the present catalyst system shows a broad substrate scope and functional group tolerance with respect to both amines and carbonyl compounds.
Synthesis of the Azetidinyl-Thiazoline Fragment of Vioprolides A and C
作者:Nathalie Chopin、Francois Couty、Gwilherm Evano
DOI:10.2174/157017810791514814
日期:2010.7.1
An efficient synthesis of the azetidinyl-thiazoline fragment of the antifungal and cytotoxic macrolides vioprolides A and C is reported. Key steps of the synthesis include formation of the thiazoline by condensation of N-Alloc- trans (2S,4R)-4-methylazetidine-2-carbonitrile with L-cysteine and formation of the four-membered ring by intramolecular alkylation of a suitably protected N-Alloc derivative prepared from (R)-alaninol.
Optically Active, Amphiphilic Poly(<i>meta</i>-phenylene ethynylene)s: Synthesis, Hydrogen-Bonding Enforced Helix Stability, and Direct AFM Observation of Their Helical Structures
Optically active, amphiphilicpoly(meta-phenylene ethynylene)s (PPEa) bearing L- or D-alanine-derived oligo(ethylene glycol) side chains connected to the backbone via amide linkages were prepared by microwave-assisted polycondensation. PPEa's exhibited an intense Cotton effect in the π-conjugated main-chain chromophore regions in various polar and nonpolar organic solvents due to a predominantly one-handed
Structure-Based Design of Potent and Selective 3-Phosphoinositide-Dependent Kinase-1 (PDK1) Inhibitors
作者:Jesús R. Medina、Christopher J. Becker、Charles W. Blackledge、Celine Duquenne、Yanhong Feng、Seth W. Grant、Dirk Heerding、William H. Li、William H. Miller、Stuart P. Romeril、Daryl Scherzer、Arthur Shu、Mark A. Bobko、Antony R. Chadderton、Melissa Dumble、Christine M. Gardiner、Seth Gilbert、Qi Liu、Sridhar K. Rabindran、Valery Sudakin、Hong Xiang、Pat G. Brady、Nino Campobasso、Paris Ward、Jeffrey M. Axten
DOI:10.1021/jm101527u
日期:2011.3.24
Phosphoinositide-dependent protein kinase-1 (PDK1) is a master regulator of the AGC family of kinases and an integral component of the PI3K/AKT/mTOR pathway. As this pathway is among the most commonly deregulated across all cancers, a selective inhibitor of PDKI might have utility as an anticancer agent. Herein we describe our lead optimization of compound 1 toward highly potent and selective PDKI inhibitors via a structure-based design strategy. The most potent and selective inhibitors demonstrated submicromolar activity as measured by inhibition of phosphorylation of PDK1 substrates as well as antiproliferative activity against a subset of AML cell lines. In addition, reduction of phosphorylation of PDK1 substrates was demonstrated in vivo in mice bearing OC1-AML2 xenografts. These observations demonstrate the utility of these molecules as tools to further delineate the biology of PDKI and the potential pharmacological uses of a PDK1 inhibitor.