A copper-catalyzed three-component reaction of terminal alkynes, TsN3, and tertiary allylic amines is developed toward the one-pot synthesis of α-allylic amidines. The product was synthesized on gram scale under 1 mol % of catalyst loading. Transformations of products into alkenyl amine and other nitrogen-containing compounds are demonstrated without any loss of stereochemical information.
A copper-catalyzed multicomponent reaction for the synthesis of thioamide skeletons
作者:Mehdi Khalaj
DOI:10.1007/s00706-019-02525-0
日期:2020.1
situ generated sulfide has been reacted with sulfonylketimine derived from the reaction of alkynes and sulfonyl azides by the action of copper salts to form a wide range of thioamide derivatives. Various terminal alkynes including aromatic, heteroaromatic, and aliphatic alkynes have been well tolerated and the reaction also shows good generality along with azides. Graphic abstract
Organocatalytic Enantioselective Synthesis of 2,3-Allenoates by Intermolecular Addition of Nitroalkanes to Activated Enynes
作者:Hui Qian、Xiuzhao Yu、Junliang Zhang、Jianwei Sun
DOI:10.1021/ja409080v
日期:2013.12.4
The first efficient intermolecular addition of nitroalkanes to activated enynes for asymmetric synthesis of 2,3-allenoates is described. It is a new addition to the limited available strategies for catalytic asymmetric synthesis of allenoates. Enabled by a new bifunctional catalyst, a range of trisubstituted allenoates can be obtained in excellent chemical and optical purity. These allenoate products
Aminium cation-radical catalysed selective hydration of (<i>E</i>)-aryl enynes
作者:Marie-Claire Giel、Andrew S. Barrow、Christopher J. Smedley、William Lewis、John E. Moses
DOI:10.1039/d1cc02257a
日期:——
The hydration of carbon–carbon triple bonds is an important and atom economic synthetic transformation. Herein, we report a mild and selective method for the catalytic Markovnikov hydration of (E)-aryl enynes to the corresponding enones, mediated through the bench-stable aminium salt, tris(4-bromophenyl)ammoniumyl hexachloroantimonate (TBPA). The chemoselective and diastereoselective method proceeds
碳-碳三键的水合是一种重要的原子经济合成转化。在此,我们报告了一种温和且选择性的催化马尔科夫尼科夫水合 ( E )-芳基烯炔生成相应烯酮的方法,该方法通过稳定的铵盐三(4-溴苯基)六氯锑酸铵 (TBPA) 介导。化学选择性和非对映选择性方法在中性无金属条件下进行,从末端和内部炔烃单元提供出色的产品收率。生物学上重要的 ( E )-3-苯乙烯基异香豆素的合成,包括天然产物 achlisocoumarin III 的正式合成,证明了这种新型转化的效用。
Ruthenium(III) acetylacetonate [Ru(acac)<sub>3</sub>] — An efficient recyclable catalyst for the acetylation of phenols, alcohols, and amines under neat conditions
作者:Ravi Varala、Aayesha Nasreen、Srinivas R Adapa
DOI:10.1139/v06-191
日期:2007.2.1
amount of ruthenium(III) acetylacetonate (2 mol%) [Ru(acac)3] enables solvent-free acetylation of phenols, alcohols, and amines at ambient temperature in good to excellent yields. Furthermore, the catalyst could be recovered and reused at least three times without a significant loss in yields.Key words: acetylation, protecting groups, ruthenium(III) acetylacetonate, phenols, alcohols, amines.