99192-61-7Relevant academic research and scientific papers
The Trityl Cation Embedded into a [7]Helicene-Like Backbone: Preparation and Application as a Lewis Acid Catalyst
Gross, Benjamin M.,Oestreich, Martin
, p. 2512 - 2516 (2021)
The synthesis of a helically chiral carbenium ion is reported. The new motif is essentially a trityl cation embedded into a [7]helicene-like framework. The key step in its preparation establishes the π-extended fluorenone system in one step by an unprecedented palladium-catalyzed carbonylative annulation of a 4,4′-biphenanthryl-3,3′-diyl precursor. The racemic form of the new carbon Lewis acid was found to catalyze a representative set of reactions typically promoted by the trityl cation.
ScIII-Doped zeolites as new heterogeneous catalysts: mukaiyama aldol reaction
Olmos, Andrea,Alix, Aurelien,Sommer, Jean,Pale, Patrick
supporting information; experimental part, p. 11229 - 11234 (2010/04/28)
ScIII-doped solids based on zeolite materials have been investigated for the first time as catalysts in organic synthesis. Sc III-USY zeolite proved to be a novel and very efficient heterogeneous catalyst for the Mukaiyama aldol reaction. This easy-to-prepare catalyst exhibited wide scope and compatibility with functional groups and is very simple to use, easy to remove (by simple filtration), and is recyclable (up to three times without loss of activity).
Synthesis of cyclobutanones and four-membered enol ethers by using a rearrangement reaction of enol triflates
Tanino, Keiji,Aoyagi, Kotaro,Kirihara, Yasuhiro,Ito, Yoshikazu,Miyashita, Masaaki
, p. 1169 - 1172 (2007/10/03)
A new synthetic method of cyclobutanone derivatives and four-membered enol ethers via an intramolecular cyclization of a ketone enolate was developed. The cyclization precursors, enol triflates having a silyloxy group at the β′-position, were synthesized from the corresponding β-hydroxy ketones, which were prepared via an aldol reaction of a cycloalkanone and an aldehyde. Under the influence of TBAF, the enol triflates afforded a cyclobutanone or a four-membered enol ether through rearrangement of the trifluoromethanesulfonyl group followed by an intramolecular C- or O-alkylation reaction.
An Efficient and Extremly Mild Catalyst System, Combined Use of Trityl Chloride and Tin(II) Chloride, in the Aldol and Michael Reactions
Mukaiyama, Teruaki,Kobayashi, Shu,Tamura, Masanori,Sagawa, Yukihiro
, p. 491 - 494 (2007/10/02)
The aldol reaction of silyl enol ethers with acetals or aldehydes, and the Michael reaction of silyl enol ethrs with α,β-unsaturated ketones are efficiently catalyzed by the combined use of trityl chloride and tin(II) chloride under extremly mild conditio
TRITYL SALTS AS EFFICIENT CATALYSTS IN THE ALDOL REACTION
Kobayashi, Shu,Murakami, Masahiro,Mukaiyama, Teruaki
, p. 1535 - 1538 (2007/10/02)
In the presence of a catalytic amount of trityl salts, such as TrOTf, TrSbCl6, TrPF6, TrSnCl5, etc., silyl enol ethers react with aldehydes to give the corresponding aldols in good yields.The preferential formations of erythro or threo aldols become possi
