An entry to indole quinones using in situ generated nitrobenzoquinone
作者:Huangchao Yu、George A. Kraus
DOI:10.1016/j.tetlet.2018.02.072
日期:2018.4
A direct synthesis of polycyclic indoles from nitrohydroquinone and indoles is reported. Pentacyclic adducts can be obtained by a tandem conjugate addition/Diels-Alder strategy.
Dearomative Indole (3 + 2) Reactions with Azaoxyallyl Cations – New Method for the Synthesis of Pyrroloindolines
作者:Maria C. DiPoto、Russell P. Hughes、Jimmy Wu
DOI:10.1021/jacs.5b10221
日期:2015.12.2
report the first examples of the synthesis of pyrroloindolines by means of (3 + 2) dearomative annulation reactions between 3-substituted indoles and highly reactive azaoxyallyl cations. Computational studies using density functional theory (DFT) (B3LYP-D3/6-311G**++) support a stepwise reaction pathway in which initial C–C bond formation takes place at C3 of indole, followed by ring closure to give
herein for the simple, convenient and efficient oxidation of indoles to isatins using pyridinium chlorochromate with the aid of polyaniline salt catalyst at room temperature or at reflux in dichloroethane. Interestingly, oxidation of 3-alkyl indoles by this procedure gave 3-hydroxy 3-alkyl oxindoles. On the other hand, indol-3-alkanols gave mixtures of isatins and 3-formyl indoles. This is the first example