The Reactions of Electron-Rich Heterocycles with Derivatives of Orthocarboxylic Acids; VIII. Proton Acid-Catalyzed Acylation of Indoles by 2-Alkoxy-1,3-dioxolanes
作者:Eyüp Akgün、Mustafa Tunali、Ulf Pindur
DOI:10.1002/ardp.19873200504
日期:——
In acid‐catalyzed reactions with 3‐unsubstituted indoles 1, 2‐alkoxy‐1,3‐dioxolanes 2a‐c behave as acyl equivalents. Depending on the substitution patterns of the reaction partners, the 1,3‐dioxolanium ions 3a‐c, generated in situ from the cyclic ortho esters by the action of sulfosalicylic acid, react to form tris‐(3‐indolyl)alkanes 6 and 9, bis‐(3‐indolyl)ethenes 7, or 3‐benzoylindoles 8. Analogous
Synthesis of tris(indolyl)methanes by using dimethyl carbonate as a single carbon source via C-H functionalization approach
作者:Priyanka Nath、Mohit L. Deb、Pranjal K. Baruah
DOI:10.1007/s11696-023-03150-2
日期:2024.1
report a copper acetate/tert-butyl hydroperoxide-mediated reaction of N-substituted indoles with dimethyl carbonate under heating to give tris(indolyl)methanes via α-C-H functionalization of the methoxy group of dimethyl carbonate. The central methine carbon in the product comes from the dimethyl carbonate molecule, which is used as a substrate as well as a reaction medium. The reaction uses a cheap and
First General Solvent‐Free Synthesis of Symmetrical Triindolylmethanes Using Acid‐Washed Montmorillonite Clay
作者:Manas Chakrabarty、Sandipan Sarkar、Anthony Linden、Bridget K. Stein
DOI:10.1081/scc-120034161
日期:2004.12.31
Dry reaction of indoles and alkylindoles (la-h) with triethyl orthoformate (2.5 equiv.) on acid-washed montmorillonite K10 clay at room temperature afforded in <5 min-4 hr the respective symmetrical TIMs (2a-h) in good to high yields along with the formylindole 3 and the formyl-TIM 4 from 1g and 1h, respectively.