Copper(II) bromide-catalyzed conjugate addition of furans to α,β-unsaturated carbonyl compounds
作者:Alexander A. Fadeev、Maxim G. Uchuskin、Igor V. Trushkov、Anton S. Makarov
DOI:10.1007/s10593-018-2206-1
日期:2017.12
A simple method for the synthesis of 2-(3-oxoalkyl)furan derivatives based on conjugate addition of 2-substituted furans to various α,β-unsaturated carbonyl compounds in the presence of copper(II) bromide as catalyst was developed.
Gold nanodots self-assembled polyelectrolyte film as reusable catalyst for reduction of nitroaromatics
作者:Perumal Viswanathan、Ramasamy Ramaraj
DOI:10.1007/s12039-017-1405-0
日期:2018.1
homogeneous catalyst from the reaction mixture is a crucial and difficult process in any catalytic process. To address this issue, a new class of multifunctional catalyst in the form of film was developed using a facile approach to enjoy the advantages of homogeneous catalyst with the versatility of heterogeneous catalyst. To achieve the same, methionine-capped gold nanodots (AuNDs) were self-assembled on a
The Cs2CO3-catalyzed reaction of 2-oxindoles with enones affords 2,2-disubstituted indolin-3-ones through domino “Michael addition–oxidation–ring-cleavage–C–N coupling” process. O2 acts as the sole oxidant to accomplish the oxidative process. The indolin-3-ones can be further transformed to pyridazine, azirdine-fused 3-oxindoles, 4-quinolone derivatives easily.
Cs 2 CO 3催化的2-氧吲哚与烯酮的反应通过多米诺“迈克尔加成-氧化-环断裂-C-N偶联”过程得到2,2-二取代的吲哚-3-酮。O 2充当完成氧化过程的唯一氧化剂。吲哚-3-酮可以容易地进一步转化为哒嗪,阿兹丁稠合的3-氧吲哚,4-喹诺酮衍生物。
A boron–nitrogen transborylation enabled, borane-catalysed reductive cyanation of enones
作者:Kieran Benn、Kieran Nicholson、Thomas Langer、Stephen P. Thomas
DOI:10.1039/d1cc03649a
日期:——
introduction of a nitrile group into organic molecules and an orthogonal route for the installation of a wide array of functional groups using simple transformations. Cyanation methods are dominated by transition metal catalysis and the use of hydrogen cyanide gas. Here, the electrophilic cyanation of enones was achieved using a main-group catalyst and a non-toxic, electrophilic cyanide source. This protocol
氰化提供了一种将腈基引入有机分子的简单方法,以及使用简单转化安装各种官能团的正交途径。氰化方法主要是过渡金属催化和使用氰化氢气体。在这里,烯酮的亲电氰化是使用主基催化剂和无毒的亲电氰化物源实现的。该协议适用于广泛的底物范围,包括那些含有可还原官能团的底物。机理研究表明,氨基硼烷中间体经过 B-N 转移(B -N / B- H 交换)以实现催化转化。
Phosphonium Ionic Liquid Catalyzed an Efficient Synthesis of Chalcones
A clean and efficient method for the synthesis of chalcones using phosphonium ionic liquid catalyst [PhosILCl] has been described. The method provides several advantages, such as mild reaction conditions, simple work-up procedure, afford high yields and ecofriendly. In addition, the green solvent ionic liquid was recovered and reused several times in subsequent reactions.