Regio- and Stereoselective Synthesis of Fluoroalkenes by Directed Au(I) Catalysis
摘要:
Au-catalyzed hydrofluorination reactions of a range of functionalized alkynes are reported. In the presence of an appropriate directing group, localized with particular spacing from the pendant alkyne, regioselective and predictable conversion of the alkyne to the Z-vinyl fluoride may be achieved, In selected cases, yields and selectivities are excellent. Additional experiments with two directing groups installed have established some initial principles with respect to a hierarchy of directing groups and their capacity for influencing hydrofluorination regioselectivity.
Mannich Reactions of Alkynes: Mechanistic Insights and the Role of Sub-Stoichiometric Amounts of Alkynylcopper(I) Compounds in the Catalytic Cycle
作者:Benjamin R. Buckley、Amna N. Khan、Harry Heaney
DOI:10.1002/chem.201103987
日期:2012.3.26
alkynylcopper(I) compounds observed in the three‐component Mannichreactions of alkynes, secondary amines and aldehydes are shown to be pre‐catalysts that give rise to catalytic copper(I) alkyne complexes by interaction with secondary amines (see scheme). Interaction of these complexes with iminium ions (formed from aldehydes or their equivalents, including CH2Cl2), results in the formation of Mannich bases
The present invention relates to a method for easily producing a tertiary amine with high yield. A tertiary amine represented by general formula (1) is produced by adding a metal-containing reagent represented by general formula (6) into a reaction system consisting of thioamide represented by general formula (4), a methylating agent represented by general formula (5) and a solvent, and then adding thereto a Grignard reagent represented by general formula (7).
1
CH
3
—X (5)
R
8
-M
1
(6)
R
7
-M
2
(7)
or terminal propargylamines and chalcones via A3-coupling reaction of aldehydes, amines, and alkynes catalyzed by an easily available catalyst Ag2CO3 under solvent-free condition. The reaction proceeded smoothly to deliver various products in good-to-excellent yields with good functional group tolerance. Gram-scale preparation, bioactive molecule synthesis and asymmetric substrates have been demonstrated
几个简单,快速和实用的协议已被开发来合成内部或末端炔丙胺和查耳酮通过甲3 -耦合醛,胺的反应,和炔由容易获得的催化剂催化的Ag 2 CO 3无溶剂条件下进行。反应进行得很顺利,以良好的收率和良好的官能团耐受性提供了各种产品。已经证明了克级制备,生物活性分子合成和不对称底物。此外,已经提出了合成不同产物的合理机制。
An efficient synthesis of propargylamines via C–H activation catalyzed by copper(<scp>i</scp>) in ionic liquids
作者:Soon Bong Park、Howard Alper
DOI:10.1039/b416268d
日期:——
A readily available copper(I) catalyst, in an ionic liquid, can effect three-component coupling of aldehydes, amines and alkynes to generate propargylamines in high yields.
一种 readily available (易得的)铜(I) 催化剂,使用离子液体,可以实现醛、胺和炔烃的三组分耦合,生成高产率的丙炔胺。
Semiconductor-Gold Nanocomposite Catalysts for the Efficient Three-Component Coupling of Aldehyde, Amine and Alkyne in Water
作者:Leng Leng Chng、Jun Yang、Yifeng Wei、Jackieâ Y. Ying
DOI:10.1002/adsc.200900518
日期:2009.11
An efficient heterogeneous lead sulfide-gold catalyst has been successfully developed for the synthesis of propargylic amines via a three-componentcoupling reaction of aldehyde, amine and alkyne in water. The process is simple and applicable to a diverse range of aromatic and aliphatic aldehydes, amines and alkynes. Furthermore, the catalyst is stable to air and water, and can be easily recovered