A general synthetic route to indolesfrom readily available anilines and epoxides by using ruthenium catalysis is described. This straightforward transformation allows a variety of indoles to be obtained in good yields by using [Ru3(CO)12]/1,1′‐bis(diphenylphosphino)ferrocene as the catalytic system. Water and hydrogen are formed as the only stoichiometric by‐products, making this process highly atom
Oxygenophilic Lewis Acid Promoted Synthesis of 2-Arylindoles from Anilines and Cyanoepoxides in Alcohol
作者:Chuangchuang Xu、Jiaxi Xu
DOI:10.1021/acs.joc.8b02203
日期:2018.12.7
A convenient synthetic method to indoles from anilines and cyanoepoxides was developed under the catalysis of BF3·OEt2 or AlCl3 in alcohols. The reaction involves a tandem reaction of the regiospecific ring-opening of cyanoepoxides with anilines, elimination of cyanide, intramolecular aromatic electrophilic substitution, and water elimination. The Lewis acid generated protic acid is an efficient catalyst
PtCl2-catalyzed reactions of o-alkynylanilines with ethyl propiolate and dimethyl acetylenedicarboxylate
作者:Xun Li、Jun-Yan Wang、Wei Yu、Long-Min Wu
DOI:10.1016/j.tet.2008.11.095
日期:2009.2
The PtCl2-catalyzed reactions between indoles and ethylpropiolate gave rise to mono and double addition products. The composition of the products was largely influenced by the substituents on the indoles as well as the amount of ethylpropiolate used. o-Alkynylanilines reacted with ethylpropiolate and dimethyl acetylenedicarboxylate under the catalysis of PtCl2 to generate the corresponding 2,3-disubstituted
2-Substituted indoles have been efficiently obtained by selective arynic cyclisation of halogenated aryl imines of methyl ketones in the presence of the complex-base NaNH2–ButONa and by PhCH2SH–AlCl3 opening of tetrahydrothiopyranoindoles also obtained from arynic cyclisation of imines.