Z-Selective hydroamidation of terminal alkynes with secondary amides and imides catalyzed by a Ru/Yb-system
作者:Annette E. Buba、Matthias Arndt、Lukas J. Gooßen
DOI:10.1016/j.jorganchem.2010.08.034
日期:2011.1
to catalyze the addition of nitrogen nucleophiles to terminalalkynes under mild conditions to stereoselectively form the Z-enamide or Z-enimide products. Various secondaryamides and imides could be added across the triple bond of a range of aliphatic and aromatic alkynes. The new bimetallic catalyst system sets new standards with regard to scope and selectivity for the synthesis of Z-configured anti-Markovnikov
Phosphine-Catalyzed Vinylation at Low Acetylene Pressure
作者:Nikolai A. Sitte、Maximilian Menche、Pavel Tužina、Frank Bienewald、Ansgar Schäfer、Peter Comba、Frank Rominger、A. Stephen K. Hashmi、Thomas Schaub
DOI:10.1021/acs.joc.1c01807
日期:2021.9.17
The vinylation of various nucleophiles with acetylene at a maximum pressure of 1.5 bar is achieved by organocatalysis with easily accessible phosphines like tri-n-butylphosphine. A detailed mechanistic investigation by quantum-chemical and experimental methods supports a nucleophilic activation of acetylene by the phosphine catalyst. At 140 °C and typically 5 mol % catalyst loading, cyclic amides,
与乙炔各种亲核试剂在1.5巴的最大压力的乙烯化是通过用有机催化方便膦等三-实现ñ丁基膦。通过量子化学和实验方法进行的详细机理研究支持膦催化剂对乙炔的亲核活化。在 140 °C 和通常 5 mol% 催化剂负载下,环酰胺、恶唑烷酮、脲、不饱和环胺和醇成功乙烯基化。此外,乙烯基鏻物种的原位生成也可用于醛的 Wittig 型官能化。
Cesium Carbonate-Promoted Hydroamidation of Alkynes: Enamides, Indoles and the Effect of Iron(III) Chloride
作者:María Teresa Herrero、Jokin Díaz de Sarralde、Raul SanMartin、Laura Bravo、Esther Domínguez
DOI:10.1002/adsc.201200430
日期:2012.11.12
A series of enamide derivatives was prepared by a simple procedure for the hydroamidation of alkynes with amides and sulfonamides. The use of such a mild base as cesium carbonate promotes the latter transformation, and the addition of catalytic amounts of iron(III) chloride has a beneficial effect in the outcome of some of the presented hydroamidation reactions. A range of indoles was also synthesized
通过简单的方法制备了一系列的酰胺衍生物,用于炔烃与酰胺和磺酰胺的加氢酰胺化。使用诸如碳酸铯之类的弱碱可以促进后者的转化,并且催化量的氯化铁(III)的添加在某些所述加氢酰胺化反应的结果中具有有益的作用。还通过两种互补方法从邻-炔基苯胺合成了一系列吲哚,这对于从邻-(2-氨基苯基炔基)苯胺构建吲哚并[1,2- c ]喹唑啉四环体系是有用的。
A convenient synthesis of enamides and dienamides by Horner-Wittig and Wadsworth-Emmons reactions
作者:Axel Couture、Eric Deniau、Pierre Grandclaudon
DOI:10.1016/s0040-4039(00)60323-4
日期:1993.2
Various N-acyl-N-alkyl-1-amino-alkenes and −1,3-dienes have been efficiently prepared by reacting aldehydes or ketones 3 with N-alkyl-N-(diphenylphosphinoyl)methyl and −N-(diethoxyphosphoryl)methyl carboxamides 1, 2.
Anti-Markovnikov stereoselective hydroamination and hydrothiolation of (hetero)aromatic alkynes using a metal-free cyclic trimeric phosphazene base
作者:Na Zhao、Chengdong Lin、Lirong Wen、Zhibo Li
DOI:10.1016/j.tet.2019.04.075
日期:2019.6
Hydroamination and hydrothiolation are the most efficient and completely atom-economical process to construct important enamine and vinylsulfide intermediates in pharmaceutical and organic chemistry. The cyclic trimeric phosphazene base (CTPB) showed great catalytic activity for the anti-Markovnikov stereoselective hydroamination and hydrothiolation of alkynes in good to excellent yields. A broad