Pd/C and RuCl2(PPh3)3/DPEphos effectively catalyzed the alkylation of indole with alcohols to give 3‐substituted indoles selectively. Various types of substrates were examined and were found to give the corresponding 3‐substituted indoles in up to 99 % yield. Under different reaction conditions, RuCl2(PPh3)3/DPEphos catalyzed the selective formation of bis(3‐indolyl)phenylmethane derivatives.
General and Selective C-3 Alkylation of Indoles with Primary Alcohols by a Reusable Pt Nanocluster Catalyst
作者:S. M. A. Hakim Siddiki、Kenichi Kon、Ken-ichi Shimizu
DOI:10.1002/chem.201302464
日期:2013.10.18
The platinum rule: Heterogeneous, additive‐free C‐3 selectivealkylation of indoles by aliphatic and aromatic alcohols proceeded under transfer hydrogenation conditions with the reusablePt/θ‐Al2O3 catalyst (see scheme; TON=turnover number).
铂规则:异构,通过转移氢化的条件下进行与可重复使用的Pt /θ-Al系的脂肪族和芳族醇吲哚不含添加剂的C-3选择性烷基化2 ö 3催化剂(参见方案; TON =周转数)。
Cobalt-catalysed CH-alkylation of indoles with alcohols by borrowing hydrogen methodology
作者:Bei Zhou、Zhuang Ma、Asma M. Alenad、Carsten Kreyenschulte、Stephan Bartling、Matthias Beller、Rajenahally V. Jagadeesh
DOI:10.1039/d2gc00469k
日期:——
interesting class of heterocyclic compounds widely used in organic synthesis and medicinal chemistry. Key for this synthesis is the use of specific cobalt-nanoparticles supported on N-doped carbon, which were conveniently prepared by the pyrolysis of a templated material generated in situ by mixing cobalt-nitrate, zinc-nitrate, 2,6-diaminopyridine, and colloidal silica, and subsequent removal of silica
报道了吲哚与醇的一般多相钴催化 CH-烷基化。利用这种直接的借氢方法,一系列取代和官能化的吲哚很容易与包括甲醇在内的苄醇、杂环醇和脂肪醇偶联,以制备 >65 个取代的吲哚,产率从良好到优异。所得产物代表了广泛用于有机合成和药物化学的一类有趣的杂环化合物。该合成的关键是使用负载在 N 掺杂碳上的特定钴纳米颗粒,这些纳米颗粒是通过混合硝酸钴、硝酸锌、2,6-二氨基吡啶和胶体二氧化硅,然后除去二氧化硅。
Disproportionative Condensations. IV. The 3-Alkylation of Indoles by Primary and Secondary Alcohols<sup>1</sup>