general synthetic method for a wide range of medicinally useful 2-carboxylate derivatives of acridinols, quinolinols, and naphthalenols has been developed via silver-catalyzed electrophilic cyclization of 3-(2-alkynyl)aryl-β-ketoesters. The designed reaction involved selective C–C bond formation on more electrophilic alkynyl carbon, which resulted in the regioselective 6-endo-dig cyclized product, as confirmed
Dual function of carbon tetrachloride: synthesis of chlorinated heterocycles
作者:Shiv Kumar、Rakesh K. Saunthwal、Kapil M. Saini、Akhilesh K. Verma
DOI:10.1039/c9cc04746h
日期:——
An efficient tandem approach to invent highly chlorinated and structurally diversified dihydropyridine fused heterocycles from easily accessible ortho-alkynylaldehydes and primary amines under metal-free conditions via four sequential bond formations is described. The proposed tandem route proceeds via a carbon tetrachloride-mediated 6-endo-dig ring closure followed by nucleophilic attack of the trichloromethyl
Cs
<sub>2</sub>
CO
<sub>3</sub>
Catalyzed Intramolecular Aminocarbonylation of Alkynes: Synthesis of 3‐Amino‐1
<i>H</i>
‐inden‐1‐ones from
<i>N</i>
‐
<i>tert</i>
‐Butyl‐2‐(1‐alkynyl)benzaldimines
作者:Zhen Guo、Tao Liu、Xiujuan Liang、Yuting Wu、Tuanli Yao
DOI:10.1002/adsc.201901349
日期:2020.3.4
3‐amino‐1H‐inden‐1‐ones from N‐tert‐butyl‐2‐(1‐alkynyl)benzaldimines via intramolecular aminocarbonylation of alkynes using Cs2CO3 as catalyst and air as oxidant has been developed. This highly atom‐efficient, transition‐metal‐free reaction proceeds under thermal conditions. We propose that the reaction proceeds through an unprecedented 5‐exo‐dig cyclization of N‐tert‐butyl‐2‐(1‐alkynyl)benzaldimines and thermal
的各种各样的合成3-氨基-1- ħ茚-1-酮从ñ -叔丁基-2-(1-炔基)经由使用铯炔烃的分子内的氨基羰基benzaldimines 2 CO 3作为催化剂和空气作为氧化剂具有已开发。这种高原子效率,无过渡金属的反应在热条件下进行。我们建议,通过了前所未有的5-反应进行外切-挖环化ñ -叔丁基-2-(1-炔基)benzaldimines和3-亚甲基2λ热重排2 -isoindolin -1-醇。
Triple‐Bond Directed Csp
<sup>2</sup>
−N Bond Formation with
<i>N</i>
‐Fluorobenzenesulfonimide as Aminating Source: One‐Step Transformation of Aldehydes into Amines
作者:Sushmita、Trapti Aggarwal、Norio Shibata、Akhilesh K. Verma
DOI:10.1002/chem.201903495
日期:2019.12.13
amination of ortho‐alkynyl quinoline/pyridine aldehydes using N‐fluorobenzenesulfonimide as nitrogen source under mild reaction conditions has been described. The designed reaction strategy was triggered by trapping of fluorine by base with subsequent attack of bis(phenylsulfonyl)‐λ2‐azane on the carbonyl carbon of a heterocycle, which was gradually converted into the corresponding amine through a Curtius
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。