Intra- and Intermolecular Alkylation of <i>N</i>,<i>O</i>-Acetals and π-Activated Alcohols Catalyzed by in Situ Generated Acid
作者:Mélanie Hamon、Niall Dickinson、Alice Devineau、David Bolien、Marie-José Tranchant、Catherine Taillier、Ivan Jabin、David C. Harrowven、Richard J. Whitby、A. Ganesan、Vincent Dalla
DOI:10.1021/jo4015886
日期:2014.3.7
allow significant reaction rate enhancements and made possible some challenging reactions such as the α-amidoalkylation of ketones. Studies using flow chemistry confirmed not only that very low concentrations of HCl generated from the solvent were responsible for the reactivity but also that TCE had additional beneficial properties in comparison to other chlorinated solvents such as dichloroethane.
One-Pot Hydroxy Group Activation/Carbon-Carbon Bond Forming Sequence Using a Brønsted Base/Brønsted Acid System
作者:Alice Devineau、Guillaume Pousse、Catherine Taillier、Jérôme Blanchet、Jacques Rouden、Vincent Dalla
DOI:10.1002/adsc.201000602
日期:2010.11.22
distinct feature of the trichloroacetimidate group allows use of weaker acid catalysts such as 1,1′-bi-2-naphthol (BINOL)-derived phosphoric acid, pointing out the possible development of an enantioselective variant. This unprecedented sequential one-potBrønsted base-Brønsted acid catalysis further expands the synthetic scope of the trichloroacetimidate group.
A Multimetallic Piano-Stool Ir–Sn<sub>3</sub> Catalyst for Nucleophilic Substitution Reaction of γ-Hydroxy Lactams through <i>N</i>-Acyliminium Ions
作者:Arnab Kumar Maity、Sujit Roy
DOI:10.1021/jo202359e
日期:2012.3.16
A multimetallic piano-stool complex [Cp*Ir-(SnCl3)(2)SnCl2(H2O)(2)}] (1) having Ir-Sn-3 motif has been synthesized from [Cp*IrCl2](2) and SnCl2. The multimetallic complex catalytically promotes the nucleophilic substitution reaction (here after alpha-amidoalkylation reaction) of gamma-hydroxylactams generated from phthalimidals to obtain decorated isoindolinones in excellent yields. Succinamidals, however, lead to the substituted pyrrolidinones (thermodynamic control product) via S(N)1-type path as well as eliminated pyrrolinones (kinetic control product) via an E1-type path, depending on the reaction parameters. A straightforward application of this methodology is to synthesize benzo-fused indolizidine alkaloid mimics.