N-Acyliminium Ion Chemistry: Highly Efficient and Versatile Carbon-Carbon Bond Formation by Nucleophilic Substitution of Hydroxy Groups Catalyzed by Sn(NTf2)4
作者:Raja Ben Othman、Radouane Affani、Marie-José Tranchant、Sylvain Antoniotti、Vincent Dalla、Elisabet Duñach
DOI:10.1002/anie.200906036
日期:2010.1.18
O‐acetals are used in a catalytic, highlyefficient α‐amidoalkylation of a broad range of carbon‐centered nucleophiles, including silicon‐based components, active methylene derivatives, electron‐rich arenes, and even simple ketones (see scheme). The reactions proceed in a highlyefficient manner and typically require only 1 mol % of the Lewis superacidic reagent Sn(NTf2)4 as the catalyst.
Condensation of methyl 2-acylbenzoates with 2-arylethanamines or 2-acylanilines in the presence of trifluoroacetic acid resulted in the formation of isoindolo[1,2-a]isoquinolines or isoindolo[2,1-a]quinolines, respectively, in moderate to excellent isolated yields.
P<sub>4</sub>O<sub>10</sub>/TfOH mediated domino condensation–cyclization of amines with diacids: a route to indolizidine alkaloids under catalyst- and solvent-free conditions
作者:Ketan S. Mandrekar、Santosh G. Tilve
DOI:10.1039/d2ra02534e
日期:——
employment of either a catalyst or solvent. The use of a few aliphatic and aromatic dicarboxylic acids is shown along with various primary amines. This method is suitable for synthesizing pyrrolo[2,1-a]isoquinolines, pyrido[2,1-a]isoquinolines, and isoindolo[1,2-a]isoquinolinones in excellent yields. When phthalicacid is used, a workup with either NaBH4 or a saturated NaHCO3 solution provided 12b-H or 12b-OH
开发了一种多米诺缩合环化方法,使用 P 4 O 10 /TfOH 试剂系统合成吲哚里西啶生物碱,无需使用催化剂或溶剂。显示了一些脂肪族和芳香族二羧酸以及各种伯胺的使用。该方法适用于合成吡咯并[2,1- a ]异喹啉、吡啶并[2,1- a ]异喹啉和异吲哚[1,2- a ]异喹啉酮,收率良好。当使用邻苯二甲酸时,使用 NaBH 4或饱和 NaHCO 3溶液进行后处理得到 12 b -H 或 12 b -OH 异吲哚[1,2- a]异喹啉酮,分别。
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.