Diselenide-Mediated Catalytic Functionalization of Hydrophosphoryl Compounds
作者:Handoko、Zacharia Benslimane、Paramjit S. Arora
DOI:10.1021/acs.orglett.0c01858
日期:2020.8.7
We report a diaryldiselenide catalyst for cross-dehydrogenative nucleophilic functionalization of hydrophosphoryl compounds. The proposed organocatalytic cycle closely resembles the mechanism of the Atherton–Todd reaction, with the catalyst serving as a recyclable analogue of the halogenating agent employed in the named reaction. Phosphorus and selenium NMR studies reveal the existence of a P–Se bond
mono-α-C(sp3)–H alkylation of phosphoramide derivatives. Remarkably, di- and tri-C(sp3)–H alkylation of phosphoramides and thiophosphoramides using an acridinium photocatalyst is reported with good yield and selectivity. Mechanistic studies reveal that monoalkylation of phosphoramides by Eosin-Y follows the HAT mechanism, whereas di- and tri-C(sp3)–H alkylation by the acridinium photocatalyst follows
A tandem, one-pot, multicomponent reaction for direct α-C(sp3)−H alkylation of phosphoramides and thiophosphoramides scaffolds with in situ generated Michael acceptors are illustrated. The reaction proceeds under environmentally benign and straightforward conditions using visible light organo-photocatalysis and yields desired alkylated products with good yield and selectivity.
hazardous and corrosive PCl3, are the fundamental reactive starting materials used in organophosphorus chemistry. Here, a KBr-mediated synthesis of DAPIs involving P4, alcohols and water is presented. With the use of silica gel as the catalyst, oxone as the safe oxidant, industrially important (EtO)2P(O)H, (i-PrO)2P(O)H and (MeO)2P(O)H are prepared in 70–90% yields. Furthermore, rare metal extractant bis(2-ethylhexyl)
Ditelluride-Catalyzed synthesis of phosphoramidates: A design of experiment approach
作者:Maurício Carpe Diem Ferreira Xavier、Daniela Hartwig、Livia Conceição Lima Valente、Márcio Santos Silva
DOI:10.1016/j.tet.2022.132879
日期:2022.8
In this contribution, we describe a selective synthesis of phosphoramidates employing diphenyl ditelluride as a simple and readily available organic catalyst. To optimize the reaction conditions, a full factorial design was carried out, demonstrating that the temperature is the critical factor for the P(O)–N bonding formation. The products were obtained in moderate to excellent yields, in mild conditions
在这篇文章中,我们描述了一种使用二苯基二碲化物作为简单且容易获得的有机催化剂的氨基磷酸酯的选择性合成。为了优化反应条件,进行了全因子设计,证明温度是 P(O)-N 键形成的关键因素。产品在温和条件下以中等至优异的产率获得。此外,使用31 P 和125 Te NMR 光谱对中间体进行了表征,证实了反应机理。