Unveiling the Three-Component Phosphonylation on Alkynylaldehydes: Toolbox toward Fluorescent Molecules
作者:Deepika Thakur、Trapti Aggarwal、Muskan、Sushmita、Akhilesh K. Verma
DOI:10.1021/acs.joc.2c02915
日期:2023.2.17
A regioselective tandem approach for annulated napthyridines/isoquinolines embedded with the phosphine oxide group under mild reaction conditions has been achieved in good to excellent yields. The designed strategy involves the triflate-induced formation of new C sp3–P and C sp2–N bondformation in one pot. This protocol was also well tolerated for the construction of densely functionalized organo-phosphorylated
在温和的反应条件下,已经实现了一种区域选择性串联方法,用于嵌入氧化膦基团的环状萘啶/异喹啉,收率良好。设计的策略涉及三氟甲磺酸诱导在一个锅中形成新的 C sp 3 -P 和 C sp 2 -N 键。该协议对于以良好的产量构建密集功能化的有机磷酸化色烯也具有很好的耐受性。此外,膦衍生的磺胺二甲嘧啶和磺胺甲恶唑药物也以良好的收率成功合成。机理研究表明,离子通路和区域选择性6-内切酶的形成通过 X 射线晶体学研究证实了环化产物。有趣的是,选择性化合物的光物理研究揭示了它们的激发荧光特性。
Harnessing the Reactivity of ortho-Alkynylaldehydes: Silver Triflate Catalyzed Regioselective Synthesis of Phosphonylated Fluorescent Molecules
作者:Deepika Thakur、Shivam A. Meena、Akhilesh K. Verma、Sushmita Sushmita
DOI:10.1055/a-2356-8347
日期:2025.1
An efficient approach for the facile synthesis of phosphonylated 1,3-dihydrofuro[3,4-b]quinolines and dihydrofuro[3,4-b]pyridines is developed. Reaction proceeds by the formation of new C–P and C–O bonds affording Z-selective phosphonylated products at room temperature. Diphenylphosphine oxides and dialkyl phosphites are explicitly incorporated into the carbonyl carbon of o-alkynylaldehydes in good
开发了一种轻松合成膦酰化1,3-二氢呋喃并[3,4-b]喹啉和二氢呋喃并[3,4-b]吡啶的有效方法。反应通过形成新的 C-P 和 C-O 键进行,在室温下提供 Z-选择性膦酰化产物。二苯基氧化膦和亚磷酸二烷基酯以良好至优异的产率明确地结合到邻炔醛的羰基碳中。该反应条件温和,底物范围广泛,并在银催化剂存在下形成三个新键。机理研究表明,反应通过离子途径以 5-exo-dig 方式进行,产生 Z 选择性产物,并通过 X 射线晶体学研究得到验证。对所选化合物的光物理研究揭示了 455 nm 范围内的发射最大值。
An economical nucleophilic route toward facile synthesis of pyrano[4,3-b]quinolin-1-ones via 6-endo-dig cyclization of o-alkynylquinoline esters
作者:Neha Sharma、Mrityunjaya Asthana、Durgesh Nandini、R.P. Singh、Radhey M. Singh
DOI:10.1016/j.tet.2012.12.068
日期:2013.2
Metal-free facile synthesis of pyrano[4,3-b]quinoline-1-ones is described from methyl 2-arylethynyl-quinoline-3-carboxylates via intramolecular cyclization in excellent yields. The cyclization reactions are facilitated using cheap and easily available KOH base in MeOH. The reaction conditions did not require dry solvent, inert atmosphere, and avoid further column chromatography purification of the products. These compounds could be further used as building blocks for the synthesis of 2H-benzo[b][1,6]naphthyridin-1-one and 1-chloro-benzo[b][1,6]naphthyridines. (C) 2013 Elsevier Ltd. All rights reserved.