Copper-catalyzed cyclization reaction: synthesis of trifluoromethylated indolinyl ketones
作者:Wangqin Ji、Hai-Hong Wu、Wenbo Li、Junliang Zhang
DOI:10.1039/d1cc00960e
日期:——
A novel, simple, effective and rapid synthetic method to construct the C-2 trifluoromethylated indolinyl ketones via a copper-catalyzed cyclization reaction between N-alkylaniline and β-(trifluoromethyl)-α,β-unsaturated enones was developed. The results of the control experiments show that the reaction may involve a radical mechanism by a single-electron transfer process. Moreover, a broad substrate
Enantioselective Synthesis of Substituted Indoles Through Zirconium(IV)-Catalyzed Friedel–Crafts Alkylation
作者:José Pedro、Gonzalo Blay、Isabel Fernández、Carlos Vila
DOI:10.1055/s-0032-1317161
日期:——
Abstract The chiral complex of (R)-3,3′-Br2-BINOL and zirconium tert-butoxide catalyzes the Friedel–Craftsalkylation of indoles with enones bearing an alkyl or fluorinated group at the β-position to give indoles having a side chain at the C3 position with a tertiary stereogenic center in good yields and with excellent enantioselectivities. The chiral complex of (R)-3,3′-Br2-BINOL and zirconium tert-butoxide
Ferrocene Derived Bifunctional Phosphine-Catalyzed Asymmetric Oxa-[4+2] Cycloaddition of α-Substituted Allenones with Enones
作者:Huamin Wang、Weike Lu、Junliang Zhang
DOI:10.1002/chem.201703368
日期:2017.10.4
An efficient ferrocene‐derived bifunctional phosphine‐catalyzed enantioselective oxa‐[4+2] cycloaddition of α‐substituted allenones with a broad range of enones is investigated for the preparation of stereodefined dihydropyrans in good to excellent yields (up to 99 %) and excellent enantioselectivity (up to 99 % ee). Furthermore, a series of valuable chiral polyheterocyclic frameworks can be efficiently
Trifluoromethylated Δ1-pyrrolines have been easily synthesized in a one-pot procedure from β-(trifluoromethyl)enones. These substrates are valuable building blocks for further syntheses. For example, trifluoromethylated prolines have been obtained.