Fe-Catalyzed Novel Domino Isomerization/Cyclodehydration of Substituted 2-[(Indoline-3-ylidene)(methyl)]benzaldehyde Derivatives: An Efficient Approach toward Benzo[<i>b</i>]carbazole Derivatives
作者:Kartick Paul、Krishnendu Bera、Swapnadeep Jalal、Soumen Sarkar、Umasish Jana
DOI:10.1021/ol500505k
日期:2014.4.18
A new and efficient protocol to synthesize substituted benzo[b]carbazole derivatives has been demonstrated involving iron-catalyzed domino isomerization/cyclodehydration sequences from substituted 2-[(indoline-3-ylidene)(methyl)]benzaldehyde derivatives. The substrates could be easily made via Pd-catalyzed domino Heck–Suzuki coupling from 2-bromo-N-propargylanilide derivatives in high yields. Notably
已经证明了合成取代的苯并[ b ]咔唑衍生物的新的有效方案,该方案包括由取代的2-[(二氢吲哚-3-亚甲基)(甲基)]苯甲醛衍生物进行铁催化的多米诺骨化异构/环脱水序列。通过Pd催化的多米诺骨牌Heck-Suzuki偶联可以轻松地以高产率从2-溴-N-炔丙基苯胺衍生物制备底物。值得注意的是,通过合成多环苯并呋喃衍生物进一步例证了该两阶段多米诺策略的通用性和效率。
Palladium-Catalyzed Imidoylation-Triggered [2 + 2 + 1] Cyclization of Internal Alkyne with Isocyanides
palladium-catalyzed [2 + 2 + 1] cyclization of internalalkynes with double isocyanides is described. This facile procedure is efficient for synthesizing various pyrrolo[3,2-c]quinolin-2-amines. The reaction worked well with a broad reaction scope. In the process, it is believed that sequential double isocyanide insertion, 6-exo-dig cyclization of alkyne, and addition of an imino group are involved.
在这项工作中,描述了钯催化的内部炔烃与双异氰酸酯的[2 + 2 + 1]环化反应。该简便的方法对于合成各种吡咯并[3,2 - c ]喹啉-2-胺是有效的。该反应在广泛的反应范围内进行良好。在该方法中,据信涉及顺序的双异氰酸酯插入,炔烃的6 -exo-dig环化和亚氨基的添加。
Iron-Catalyzed Functionalization of 3-Benzylideneindoline Through Tandem Csp<sup>2</sup>
-Csp<sup>3</sup>
Bond Formation/Isomerization with π-Activated Alcohols
作者:Rupsa Chanda、Baitan Chakraborty、Gopal Rana、Umasish Jana
DOI:10.1002/ejoc.201901181
日期:2020.1.9
efficient and environmentally benign procedure for the synthesis of 3‐substituted indole derivatives using iron‐catalyzed direct substitution of alcohol with 3‐benzylidene‐1‐tosylindoline via tandem C–C bond formation and isomerization is reported.
Fe(OTf)<sub>3</sub>-Catalyzed Aromatization of Substituted 3-Methyleneindoline and Benzofuran Derivatives: A Selective Route to C-3-Alkylated Indoles and Benzofurans
作者:Sandip Kundal、Swapnadeep Jalal、Kartick Paul、Umasish Jana
DOI:10.1002/ejoc.201500540
日期:2015.9
A simple and convenient approach was developed to the selective synthesis of 3-substituted indoles and benzofurans by the isomerization of 3-methyleneindoline and benzofuran derivatives catalyzed by Fe(OTf)3. The salient features of this method are the easy availability of substrates, high yield, mild reaction conditions, tolerance of a variety of functional groups, and use of an environmentally friendly
Iron-catalyzed carboarylation of alkynes <i>via</i> activation of π-activated alcohols: rapid synthesis of substituted benzofused six-membered heterocycles
作者:Rupsa Chanda、Abhishek Kar、Aniruddha Das、Baitan Chakraborty、Umasish Jana
DOI:10.1039/d1ob00488c
日期:——
the straightforward synthesis of densely substituted 1,2-dihydroquinolines from N-propargyl anilides and π-activated alcohols. The reaction provides a new method for the synthesis of highly substituted benzofused six-membered heterocycles by the formation of two carbon–carbon bonds and one ring in a single step. The power of the methodology was further extended to the synthesis of substituted chromene