Oxidative Intramolecular 1,2‐Amino‐Oxygenation of Alkynes under Au
<sup>I</sup>
/Au
<sup>III</sup>
Catalysis: Discovery of a Pyridinium‐Oxazole Dyad as an Ionic Fluorophore
作者:Aslam C. Shaikh、Dnyanesh S. Ranade、Pattuparambil R. Rajamohanan、Prasad P. Kulkarni、Nitin T. Patil
DOI:10.1002/anie.201609335
日期:2017.1.16
Oxidative intramolecular 1,2‐amino‐oxygenation reactions, combining gold(I)/gold(III) catalysis, is reported. The reaction provides efficient access to a structurally unique ionic pyridinium‐oxazole dyad with tunable emission wavelengths. The application of these fluorophores as potential biomarkers has been investigated.
Gold-Catalyzed Cycloisomerization of Pyridine-Bridged 1,8-Diynes: An Expedient Access to Luminescent Cycl[3.2.2]azines
作者:Chetan C. Chintawar、Manoj V. Mane、Akash G. Tathe、Suprakash Biswas、Nitin T. Patil
DOI:10.1021/acs.orglett.9b02677
日期:2019.9.6
Gold-catalyzed diyne cycloisomerizations involving carbene/alkyne metathesis have been the focal point of attention for the past few years as it offers great potential to build complex polycyclic architectures. However, the design of novel cycloisomerizations has been mostly limited to 1,5/1,6- diynes and has remained very challenging to apply for higher 1,n-diynes. Herein, we disclose an unprecedented
Copper-Catalyzed Tandem Synthesis of Indolo-, Pyrrolo[2,1-<i>a</i>]isoquinolines, Naphthyridines and Bisindolo/Pyrrolo[2,1-<i>a</i>]isoquinolines via Hydroamination of <i>ortho</i>-Haloarylalkynes Followed by C-2 Arylation
作者:Akhilesh K. Verma、Rajeev R. Jha、Ritu Chaudhary、Rakesh K. Tiwari、Kotla Siva K. Reddy、Abhinandan Danodia
DOI:10.1021/jo301572p
日期:2012.9.21
An efficient approach for the copper-catalyzed regioselective tandemsynthesis of diversely substituted indolo[2,1-a]isoquinolines 11a–r, pyrrolo[2,1-a]isoquinolines 12a–d, and indolo-, pyrrolo[2,1-f][1,6]naphthyridines 14a–f via preferential addition of the heterocyclic amines onto the ortho-haloarylalkynes over N-arylation followed by intramolecular C-2 arylation is described. The scope of the developed
一种铜取代的吲哚并[2,1- a ]异喹啉11a – r,吡咯并[ 2,1 - a ]异喹啉12a – d和吲哚- ,吡咯并[2,1- ]铜催化区域选择性串联合成的有效方法。描述了通过优先将杂环胺加到邻-卤代芳基炔烃上而不是N-芳基化然后分子内C-2芳基化的f ] [1,6]萘啶14a - f。所开发化学方法的范围已成功扩展到直接合成双吲哚-,吡咯并[2,1- a ]异喹啉15a– g是双吲哚并[1,2- a ]喹啉的区域异构体,用作有机单晶场效应晶体管。羟甲基苯并三唑是一种廉价且空气稳定的化合物,已被用作配体,可将简单,易于获得的起始原料一步转化为一类有趣的杂环化合物。
Application of Isocyanides as Amide Surrogates in the Synthesis of Diverse Isoindolin-1-one Derivatives by a Palladium-Catalyzed Tandem Carboxamidation/Hydroamidation Reaction
作者:Ramdas S Pathare、Shivani Sharma、Sathish Elagandhula、Vaishali Saini、Devesh M Sawant、Monika Yadav、Ashoke Sharon、Shahnawaz Khan、Ram T Pardasani
DOI:10.1002/ejoc.201600999
日期:2016.11
The rapid synthesis of the isoindolinone skeleton has been accomplished by a palladium-catalyzed one-pot tandem process, which consists of an isocyanideinsertion/hydration (carboxamidation) and 5-exo-dig cycloisomerization (hydroamidation) reaction sequence that afforded the products in good to excellent yields. Preliminary mechanistic studies of this sequential C–C/C–O/C–N bond formation process
The intramolecular 5-exo, 7-endo-dig transition metal-free cyclization sequence of (2-alkynylphenyl) benzyl ethers: synthesis of seven-membered fused benzo[b]furans
作者:Rafaela Gai、Roberto do Carmo Pinheiro、José S. S. Neto、Bernardo A. Iglesias、Thiago V. Acunha、Davi F. Back、Gilson Zeni
DOI:10.1039/c6gc02423h
日期:——
Base-promoted cyclization of (2-alkynylphenyl) benzyl ethers was studied in details. The effects of solvent, base, temperature, reaction time and amount of base on the efficacy of the cyclization reaction was...