Site-Selective Electrophilic Cyclization and Subsequent Ring-Opening: A Synthetic Route to Pyrrolo[1,2-<i>a</i>]quinolines and Indolizines
作者:Trapti Aggarwal、Sonu Kumar、Devendra K. Dhaked、Rakesh K. Tiwari、Prasad V. Bharatam、Akhilesh K. Verma
DOI:10.1021/jo3015374
日期:2012.10.5
An efficient strategy for the synthesis of pyrrolo[1,2-a]quinolines and indolizines from pyranoquinolines via site-selective electrophilic cyclization and subsequent opening of pyran ring using silver/iodine under mildreaction conditions is described. This approach involves the preferential attack of the pyridyl nitrogen over aryl ring and leads to the formation of 5-endo-dig cyclized products. Quantum
描述了一种通过位点选择性亲电环化从吡喃并喹啉合成吡咯并[1,2- a ]喹啉和吲哚嗪的有效策略,随后在温和的反应条件下使用银/碘打开吡喃环。这种方法涉及的吡啶基的氮的优先攻击过的芳环,并导致5-地层内切-挖环化产物。C–N(ΔE a = 9.01 kcal / mol)和C–C(ΔE a为了使观察到的位点选择性合理化,进行= 31.31kcal / mol)的键形成。通过X射线晶体学研究证实了产物的结构。通过Pd催化的交叉偶联反应,通过亲电碘化反应生成的碘取代的化合物进一步多样化。
Tandem 6π-Azatriene Electrocyclization of Fused Amino-cyclopentenones: Synthesis of Functionalized Pyrrolo- and Indolo-quinoxalines
作者:Kapil Mohan Saini、Rakesh K. Saunthwal、Ankit Kumar、Akhilesh K. Verma
DOI:10.1021/acs.orglett.1c02782
日期:2021.10.1
A tandem 6π-azacyclization approach for the synthesis of diversified pyrrolo/indolo[1,2-a]quinoxalines from amino-cyclopentenones has been developed. The reaction proceeds through a trifluoroacetic-acid-mediated 6π-electrocyclization and concomitant opening of the cyclopentenone ring. The advantageous features of the developed chemistry include transition-metal-free conditions, operational simplicity
已经开发了一种用于从氨基环戊烯酮合成多样化吡咯并/吲哚[1,2- a ]喹喔啉的串联 6π-氮杂环化方法。该反应通过三氟乙酸介导的 6π-电环化和环戊烯酮环的伴随打开进行。所开发化学的优势特征包括无过渡金属条件、操作简单和广泛的底物范围。进一步的 X 射线晶体学研究证实了稠合杂环的指定结构。
Efficient synthesis via azide–alkyne Huisgen [3+2] cycloaddition reaction and antifungal activity studies of novel triazoloquinolines
New functionalized 1,2,3-triazoloquinolines were achieved by intramolecular azide–alkyne Huisgen [3+2] cycloaddition. These derivatives were synthesized via the key Baylis–Hillman adduct under mild, neutral conditions in short duration and consistently good yield. The structures of final compounds were characterized by spectral analysis. Antifungal activities of these analogues against Trichophyton
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
Highly efficient Ag(i)-catalyzed regioselective tandem synthesis of diversely substituted quinoxalines and benzimidazoles in water
作者:Vineeta Rustagi、Trapti Aggarwal、Akhilesh K. Verma
DOI:10.1039/c1gc15346c
日期:——
A green and operationally simple approach for the diverse synthesis of fused quinoxalines and benzimidazoles from o-alkynylaldehydes and amines having an N-tethered nucleophile using Ag(I) as the catalyst in water, is described. The X-ray crystallographic studies confirmed the proposed mechanistic pathway and the cyclized product.