Gold-catalyzed intramolecular hydroarylation of olefins. Scope evaluation and preliminary mechanistic studies

Gold-Catalyzed Hydroarylation Reactions: A Comprehensive Overview

The hydroarylation of alkynes, alkene, and, allene is a cost-effective and efficient way to incorporate unsaturated moieties into aromatic substrates. This review focuses on gold-catalyzed hydroarylation, which produces aromatic alkenes,...

Design, synthesis, and characterization of vinyl-addition polynorbornenes with tunable thermal properties

Substituents were introduced onto addition polynorbornenes to modify their thermal properties. The resultant materials displayed depressed glass-transition temperatures, high decomposition temperatures, and could be melt-processed.

Progress in the Chemistry of Tetrahydroquinolines

Tetrahydroquinoline is one of the most important simple nitrogen heterocycles, being widespread in nature and present in a broad variety of pharmacologically active compounds. This Review summarizes the progress achieved in the chemistry of tetrahydroquinolines, with emphasis on their synthesis, during the period from mid-2010 to early 2018.

A tethering directing group strategy for ruthenium-catalyzed intramolecular alkene hydroarylation

We report a new catalyst design for N-heterocycle synthesis that utilizes an alkene-tethered amide moiety as a directing group for aromatic C-H activation. This tethering directing group strategy is demonstrated in a ruthenium-catalyzed intramolecular alkene hydroarylation with N-aryl acrylamides to form oxindole products.

Catalytic asymmetric Friedel–Crafts synthesis of 1,1′-diaryl-2-substituted 4-pentenes enables stereoselective access to functionalized tetrahydronaphthalenes

A series of electron-rich arenes were reacted with 1-alkyl or 1-aryl 1′-allyl benzylic alcohols to give the corresponding 1,1′-diarylalkanes, in the presence of Lewis and Brønsted acids as catalysts. In the presence of HBF4, 1,1′-diarylalkanes containing an allylic chain were shown to form tetrahydronaphthalenes through a rearrangement involving spirocyclic intermediates. The mechanism of the cyclization is discussed.

Fe(OTf)3-catalysed Friedel-Crafts reaction of benzenoid arenes with α,β-unsaturated carbonyl compounds: easy access to 1,1-diarylalkanes

A simple and efficient method for the synthesis of 1,1-diarylalkanes via the Friedel-Crafts-type alkylation reaction of electron-rich arenes with cinnamic acid ester derivatives or chalcones is reported. Iron triflate has been found to be the best catalyst for the Friedel-Crafts-type alkylation reaction with α,β-unsaturated carbonyl compounds. This reaction afforded β,β-diaryl carbonyl compounds in good yields (65-93%) and with excellent regioselectivities. Remarkably, this method is also compatible with a variety of indoles to provide 3-indolyl-aryl carbonyl compounds in excellent yields. Great efforts have been made to deduce a plausible reaction mechanism based on isotopic labelling experiments.

Ligand- and Brønsted acid/base-switchable reaction pathways in gold(i)-catalyzed cycloisomerizations of allenoic acids

Competing gold-catalyzed cycloisomerizations of γ-allenoic acids are optimized through ligand and Brønsted acid/base effects, affording three distinct classes of lactones.

New developments in gold-catalyzed manipulation of inactivated alkenes

Over the recent years, the nucleophilic manipulation of inactivated carbon-carbon double bonds has gained remarkable credit in the chemical community. As a matter of fact, despite lower reactivity with respect to alkynyl and allenyl counterparts, chemical functionalization of isolated alkenes, via carbon- as well as hetero atom-based nucleophiles, would provide direct access to theoretically unlimited added value of molecular motifs. In this context, homogenous [Au(I)] and [Au(III)] catalysis continues to inspire developments within organic synthesis, providing reliable responses to this interrogative, by combining crucial aspects such as chemical selectivity/efficiency with mild reaction parameters. This review intends to summarize the recent progresses in the field, with particular emphasis on mechanistic details.

Gold(I)-catalysed one-pot synthesis of chromans using allylic alcohols and phenols

A gold(I)-catalysed reaction of allylic alcohols and phenols produces chromans regioselectively via a one-pot Friedel-Crafts allylation/intramolecular hydroalkoxylation sequence. The reaction is mild, practical and tolerant of a wide variety of substituents on the phenol.