Accessing Dihydro-1,2-oxazine via Cloke–Wilson-Type Annulation of Cyclopropyl Carbonyls: Application toward the Diastereoselective Synthesis of Pyrrolo[1,2-<i>b</i>][1,2]oxazine
作者:Pankaj Kumar、Rakesh Kumar、Prabal Banerjee
DOI:10.1021/acs.joc.0c00531
日期:2020.5.15
A convenient additive-free synthesis of dihydro-4H-1,2-oxazines via a Cloke-Wilson-type ring expansion of the aryl-substituted cyclopropane carbaldehydes with the hydroxylamine salt is introduced. Comparatively less active cyclopropyl ketones also follow a similar protocol if supplemented by catalytic p-toluene sulfonic acid monohydrate. The transformation is performed in an open-to-air flask as it
Lewis Acid-Catalyzed [3+2] Cycloaddition of Donor-Acceptor Cyclopropanes and Enamines: Enantioselective Synthesis of Nitrogen-Functionalized Cyclopentane Derivatives
作者:Kamal Verma、Prabal Banerjee
DOI:10.1002/adsc.201600221
日期:2016.6.30
efficient method for the synthesis of nitrogen‐functionalized cyclopentane derivatives via [3+2] cycloaddition of enamines with donor‐acceptor cyclopropanes in the presence of catalytic amounts of various Lewisacids at room temperature has been developed; furthermore, the corresponding β‐amino acid was synthesized by monodecarboxylation and hydrogenolysis. An enantioenriched synthesis of nitrogen‐functionalized
reaction conditions. The reaction could be carried out on a gram scale with the good results being maintained. Control experiments were performed to elucidate the specific diastereoselectivity of the reaction. The formation of single trans isomers was dominated by secondary orbital interactions between the ester groups of the dipolarophile and the azomethineimine. On the basis of the experimental results
Substituent and Lewis Acid Promoted Dual Behavior of Epoxides towards [3+2]-Annulation Reactions with Donor-Acceptor Cyclopropanes: Synthesis of Substituted Cyclopentane and Tetrahydrofuran
substituents present in both reacting partners produced different products. The C-attack gave functionalized cyclopentane derivatives while the O-attack furnished tetrahydrofuran derivatives via [3+2]-annulation reactions. Moreover, to increase the utility of our method, synthesized diasteriomeric cyclopentane derivatives were converted into synthetically useful cyclopentene and cyclopentanone analog.
Compounds and methods for treating cancer by inhibiting the urokinase receptor
申请人:Meroueh Samy O.
公开号:US09745288B2
公开(公告)日:2017-08-29
Compounds and methods for treating or preventing cancer associated with binding to the urokinase receptor are provided. Biological processes affected by the compounds include cell migration, cell growth, cell adhesion, angiogenesis, cancer cell invasion, apoptosis, tumor formation, tumor progression, metastasis, degradation of the extracellular matrix, pericellular proteolysis, activation of plasminogen, changes in the levels of an extracellular protease, and changes in the levels of a VEGF receptor.