Asymmetric Hydrogenation of Isoxazolium Triflates with a Chiral Iridium Catalyst
作者:Ryuhei Ikeda、Ryoichi Kuwano
DOI:10.1002/chem.201600732
日期:2016.6.13
enantiomeric ratio (e.r.). Chiral cis‐isoxazolidines were obtained in up to 89:11 e.r., with no formation of their trans isomers, when the substrates had a primary alkyl substituent at the 5‐position. The mechanistic studies indicate that the hydridoiridium(III) species prefers to deliver its hydride to the C5 atom of the isoxazole ring. The hydride attack leads to the formation of the chiral isoxazolidine via
N-HYDROXY-NAPHTHALENE DICARBOXAMIDE AND N-HYDROXY-BIPHENYL-DICARBOXAMIDE COMPOUNDS AS HISTONE DEACETYLASE INHIBITORS
申请人:Kattar Solomon
公开号:US20100216796A1
公开(公告)日:2010-08-26
The present invention relates to a novel class of N-hydroxy-naphthalene dicarboxamide and N-hydroxy-biphenyl-dicarboxamide derivatives. The N-hydroxy-naphthalene dicarboxamide and N-hydroxy-biphenyl-dicarboxamide compounds can be used to treat cancer. The N-hydroxy-naphthalene dicarboxamide and N-hydroxy-biphenyl-dicarboxamide compounds can also inhibit histone deacetylase and are suitable for use in selectively inducing terminal differentiation, and arresting cell growth and/or apoptosis of neoplastic cells, thereby inhibiting proliferation of such cells. Thus, the compounds of the present invention are useful in treating a patient having a tumor characterized by proliferation of neoplastic cells. The compounds of the invention may also be useful in the prevention and treatment of TRX-mediated diseases, such as autoimmune, allergic and inflammatory diseases, and in the prevention and/or treatment of diseases of the central nervous system (CNS), such as neurodegenerative diseases. The present invention further provides pharmaceutical compositions comprising the N-hydroxy-naphthalene dicarboxamide and N-hydroxy-biphenyl-dicarboxamide derivatives and safe dosing regimens of these pharmaceutical compositions, which are easy to follow, and which result in a therapeutically effective amount of the N-hydroxy-naphthalene dicarboxamide and N-hydroxy-biphenyl-dicarboxamide derivatives in vivo.
Platinum-catalyzed cyclizations viacarbene intermediates: syntheses of complementary positional isomers of isoxazoles
作者:Paul A. Allegretti、Eric M. Ferreira
DOI:10.1039/c2sc21671j
日期:——
A novelsynthesis of regioisomeric isoxazoles is described. Using catalytic platinum, both propargylic N-hydroxycarbamates and N-alkoxycarbonyl amino ethers can be cyclized to form differentially substituted isoxazoles. Reaction conditions are developed that address specific aspects of the catalytic manifold. A unique mechanism involving a Pt-carbene intermediate is proposed, and deuterium labeling