Synthesis and preliminary use of novel acrylic ester-derived task-specific ionic liquids
摘要:
Novel electrophilic alkenes bearing an ionic liquid-type appendage have been prepared and used in Diels-Alder cycloadditions, 1,4-additions, Heck couplings and Stetter reactions; this new type Of Support allows easy monitoring of the reactions by NMR and MS as well as simple and efficient work-up and isolation procedures. (C) 2003 Elsevier Ltd. All rights reserved.
The present invention relates to enzyme inhibitors. More specifically, the present invention relates to ligand-directed covalent modification of proteins; method of designing same; pharmaceutical formulation of same; and method of use.
The synthesis of γ-phenyl and γ-(n-pyridyl)paraconates was accomplished by chemical reduction of their respective ketodiester precursors followed by cyclisation of the resulting hydroxy diester intermediates. The cis- and trans-lactones thus obtained were separated and separately subjected to enzymatic hydrolysis with HLAP. The cis-lactonic esters had enantiomeric excesses ranging from 94% to 99%,
Ru<sub>3</sub>(CO)<sub>12</sub>-Catalyzed Intermolecular Cyclocoupling of Ketones, Alkenes or Alkynes, and Carbon Monoxide. [2 + 2 + 1] Cycloaddition Strategy for the Synthesis of Functionalized γ-Butyrolactones
The ruthenium-catalyzed intermolecular cyclocoupling of ketones (or aldehydes), alkenes (or alkynes), and CO, which leads to γ-butyrolactones, is described. The reaction represents the first example of the catalytic synthesis of heterocycles via an intermolecular carbonylative [2 + 2 + 1] cycloaddition. A wide variety of ketones, such as α-dicarbonyl compounds and N-heterocyclic ketones, can be used