one equivalent of 2,4,6‐trichloro‐1,3,5‐triazine (cyanuric chloride) generates an easy handling formylatingagent for the efficient formylation of these classes of compounds to give the corresponding aldehydes under mild reaction conditions. This procedure was highly efficient, and a range of formylated indoles and pyrroles were obtained in good to excellent yields.
Palladium(II)-Catalyzed Efficient C-3 Functionalization of Indoles with Benzylic and Allylic Alcohols under Co-Catalyst, Acid, Base, Additive and External Ligand-Free Conditions
作者:Debjit Das、Sujit Roy
DOI:10.1002/adsc.201300048
日期:2013.5.3
The bis(acetonitrile)palladium(II) chloride complex, PdCl2(MeCN)2, efficiently catalyzes the regioselective alkylation of indoles with various benzylic and allylicalcohols under moisture and air insensitive conditions. Notably the reaction does not require any other co‐catalyst, acid, base, additive, or external ligand.
A convenient eco-friendly system for the synthesis of 5-sulfenyl tetrazole derivatives of indoles and pyrroles employing CeCl<sub>3</sub>·7H<sub>2</sub>O in PEG-400
作者:Margiani P. Fortes、Mariana M. Bassaco、Teodoro S. Kaufman、Claudio C. Silveira
DOI:10.1039/c4ra05625f
日期:——
efficient and eco-friendly promoter system for the convenientsynthesis of 5-sulfenyl tetrazoles derived from indoles and pyrroles, is reported. The synthesis entails the [3 + 2] cycloaddition reaction of NaN3 with 3-thiocyanato indoles (including 3,3′-di-thiocyanato-1H,1H′,2,2′-biindoles) and 2-thiocyanato pyrroles. The thiocyanates were conveniently obtained by the oxone-mediated thiocyanation of differently
据报道,在聚乙二醇400(PEG-400)中使用CeCl 3 ·7H 2 O作为有效和环保的促进剂体系,可方便地合成由吲哚和吡咯衍生的5-亚磺酰基四唑。合成需要使NaN 3与3-硫代氰基吲哚(包括3,3'-二硫代氰基-1 H,1 H ',2,2'-双吲哚)和2-硫代氰基吡咯进行[3 + 2]环加成反应。硫氰酸盐可通过不同取代的起始吲哚,1 H,1 H ',2,2'-双吲哚和N-芳基吡咯与NH 4的异丁酮介导的硫氰酸氰化反应方便地获得SCN。还研究了转换的范围和局限性。
Ruthenium Catalyzed <i>N</i>
-Alkylation of Cyclic Amines with Primary Alcohols
作者:Risto Savela、Dieter Vogt、Reko Leino
DOI:10.1002/ejoc.202000167
日期:2020.5.29
A robust alcohol amination protocol using common saturated cyclic amines and primary alcohols as starting material is described for synthesis of 29 compounds. The reactions are catalyzed by combination of dichloro(p ‐cymene)ruthenium(II) dimer precatalyst with triphenylphosphine ligand. The catalyst can be precipitated by addition of hexane or cold diethyl ether, followed by isolation of the product
The ligand-free palladium-catalyzed C3-cyanation of indoles via direct C–H functionalization was achieved. This protocol, utilizing CH3CN as a green and readily available cyanide source, produced the desired products in moderate to good yields through transition-metal-catalyzed C–CN bond cleavage.