一种环境友好且操作简单的一锅法,用于在水中使用 AgI 作为催化剂从邻炔醛和芳胺中区域选择性串联合成多种取代的稠合苯并咪唑并 [2,1-a] 异喹啉、萘啶、噻吩并吡啶和喹喔啉被描述。该反应显示在更具亲电性的炔基碳上形成了选择性的 N-C 键,从而产生了区域选择性的 6-endo-dig 环化产物,产率很好。所提出的合成稠合杂环的机理途径是在环 B 之前形成环 A,环 B 是通过氮对炔基碳的第二次分子内攻击形成的,得到了分离的中间体 U 和环化产物 5a 的机械实验和 X 射线晶体学研究的支持。对比实验表明,分子内亲核攻击的可行性高于外部亲核试剂的分子间攻击。这种催化的绿色方案已有效地应用于水中的双串联环化。
一种环境友好且操作简单的一锅法,用于在水中使用 AgI 作为催化剂从邻炔醛和芳胺中区域选择性串联合成多种取代的稠合苯并咪唑并 [2,1-a] 异喹啉、萘啶、噻吩并吡啶和喹喔啉被描述。该反应显示在更具亲电性的炔基碳上形成了选择性的 N-C 键,从而产生了区域选择性的 6-endo-dig 环化产物,产率很好。所提出的合成稠合杂环的机理途径是在环 B 之前形成环 A,环 B 是通过氮对炔基碳的第二次分子内攻击形成的,得到了分离的中间体 U 和环化产物 5a 的机械实验和 X 射线晶体学研究的支持。对比实验表明,分子内亲核攻击的可行性高于外部亲核试剂的分子间攻击。这种催化的绿色方案已有效地应用于水中的双串联环化。
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
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。
On Water: Silver-Catalyzed Domino Approach for the Synthesis of Benzoxazine/Oxazine-Fused Isoquinolines and Naphthyridines from<i>o</i>-Alkynyl Aldehydes
作者:Akhilesh K. Verma、Deepak Choudhary、Rakesh K. Saunthwal、Vineeta Rustagi、Monika Patel、Rakesh K. Tiwari
DOI:10.1021/jo4009639
日期:2013.7.5
An operationally simple domino approach for the silver-catalyzed synthesis of oxazine/benzoxazine-fused isoquinolines 5a-q and naphthyridines 6a-v by the reaction of o-alkynyl aldehydes 3a-aa with amines having embedded nucleophiles 4a-d under mild reaction condition in water is described. The reaction shows selective C-N bond formation on the more electrophilic alkynyl carbon resulting in the formation of 6-endo-dig cyclized product. The competitive experiments show the viability of an intramolecular nucleo philic attack over an intermolecular attack of the external nucleophile. This methodology accommodates wide functional group variation, which proves to be useful for structural and biological assessment.
Ag<sup>I</sup>-Catalyzed Cascade Strategy: Regioselective Access to Diversely Substituted Fused Benzimidazo[2,1-<i>a</i>]isoquinolines, Naphthyridines, Thienopyridines, and Quinoxalines in Water
bond formation on the more electrophilic alkynyl carbon, resulting in the regioselective 6-endo-dig cyclized products in good to excellent yields. The proposed mechanistic pathway for the synthesis of fused heterocycles proceedingthrough formation of ring A prior to ring B, which formed through a second intramolecular attack of the nitrogen onto the alkynyl carbon, was supported by mechanistic experiments
一种环境友好且操作简单的一锅法,用于在水中使用 AgI 作为催化剂从邻炔醛和芳胺中区域选择性串联合成多种取代的稠合苯并咪唑并 [2,1-a] 异喹啉、萘啶、噻吩并吡啶和喹喔啉被描述。该反应显示在更具亲电性的炔基碳上形成了选择性的 N-C 键,从而产生了区域选择性的 6-endo-dig 环化产物,产率很好。所提出的合成稠合杂环的机理途径是在环 B 之前形成环 A,环 B 是通过氮对炔基碳的第二次分子内攻击形成的,得到了分离的中间体 U 和环化产物 5a 的机械实验和 X 射线晶体学研究的支持。对比实验表明,分子内亲核攻击的可行性高于外部亲核试剂的分子间攻击。这种催化的绿色方案已有效地应用于水中的双串联环化。