Water and fluorinated alcohol mediated/promoted tandem insertion/aerobic oxidation/bisindolylation under metal-free conditions: Easy access to bis(indolyl)methanes
from indoles and diazocompounds has been developed. The combination of water and fluorinated alcohol plays dual roles as solvent and promoter in this chemical transformation. Molecular oxygen in the air acts as an oxidant. 3,3′-Bis(indolyl)methanes with quaternary carbon were produced under metal-free conditions. No any catalyst and additive were required. N2 and water were released as sole by-products
Asymmetric Friedel–Crafts Alkylations of Indoles with Ethyl Glyoxylate Catalyzed by (S)-BINOL-Titanium(IV) Complex: Direct Access to Enantiomerically Enriched 3-Indolyl(hydroxy)acetates
EnantioselectiveFriedel–Craftsalkylation reactions of a variety of indoles with ethyl glyoxylate, catalyzed by a chiral (S)-BINOL-Ti(IV) complex (10 mol %), are reported. The corresponding ethyl 3-indolyl(hydroxy)acetates were formed in good yields and with high enantiomeric excess (up to 96 %). When methyl pyruvate or p-chlorophenylglyoxal was used, the bisindole compound was obtained in excellent
Room temperature MgI2-catalyzed Friedel–Crafts reaction between electron-rich (het)arenes and ethyl glyoxylate
作者:Mikhail N. Feofanov、Boris A. Lozhkin、Maksim V. Anokhin、Alexey D. Averin、Irina P. Beletskaya
DOI:10.1016/j.mencom.2018.07.030
日期:2018.7
Magnesium iodide-catalyzed addition of electron-rich (het)arenes to ethyl glyoxylate proceeds at room temperature with high chemoselectivity to afford ethyl 2-(het)aryl- 2-hydroxyacetates in yields up to 95%.
Friedel-Crafts Reaction of Indole Derivatives Using the Iminium Salt Generated by the Oxidation of Amino Ketene Silyl Acetal
作者:Makoto Shimizu、Takuya Iwao
DOI:10.3987/com-08-s(f)66
日期:——
- Friedel-Craftsreaction of various indole derivatives proceeded with the iminium salt generated by the oxidation of amino ketene silyl acetal to give the addition products in good yields. Further reaction of the introduced glycine moiety of the adducts with the second nucleophiles provided double nucleophilic addition products.