Search

The epoxide opening with BF3·OEt2 followed by cleavage of the aldehyde group of the resulting β-ketoaldehyde furnishes deoxybenzoins which give the title furans after HBr-promoted ring closure. [ABSTRACT FROM AUTHOR]

A novel tandem Pauson-Khand type reaction of 1,4-enynes (I) tethered by a cyclopropyl group with CO (II) proceeds in the presence of a Rh-catalyst under CO atmosphere to give the corresponding inden-1-one derivatives (III) in moderate yields. [ABSTRACT FROM AUTHOR]

The novel title catalyst enables facile access to corresponding cyclopentene and cyclohexene derivatives under mild conditions. [ABSTRACT FROM AUTHOR]

An organocatalytic method for preparation of the labile title compounds is presented. [ABSTRACT FROM AUTHOR]

Review: [60 refs.] [ABSTRACT FROM AUTHOR]

A phase-transfer catalyst promoted intramolecular transformation of pyrrole-2-carbaldehyde substituted Morita-Baylis-Hillman adducts as an efficient way to construct pyrrolo[1,2-a]azepin-7(6H)-one skeletons in moderate to good yields is presented. [ABSTRACT FROM AUTHOR]

The new synthetic strategy is based on an unprecedented addition of an allenic ester moiety to the C=N bond of hydrazones like (I), (III), and (V). [ABSTRACT FROM AUTHOR]

A cyclization of aldehyde imines with alkynes yields isoquinolinium triflates efficiently. [ABSTRACT FROM AUTHOR]

The TFA-mediated intramolecular cycloisomerization of substrates (I) gives rise to azocino[5,4-b]indoles (II), whilst the reaction of aryl-substituted cyclopropenes (III) does not stop at the stage of azocino[5,4-b]indoles, but affords tetracyclic products (IV). [ABSTRACT FROM AUTHOR]

The intramolecular hydroarylation of methylenecyclopropanes containing aryl propargyl ethers gives 2H-chromene derivatives under mild conditions. [ABSTRACT FROM AUTHOR]

A gold-catalyzed intramolecular cycloisomerization of cyclopropenes, N- or O-tethered, affords 5-azaspiro[2.5]oct-7-enes and bicyclo[4.1.0]heptanes depending on the substitution pattern. [ABSTRACT FROM AUTHOR]

The title reaction probably involves a carbondiimide intermediate and it undergoes cyclization and thermal-induced rearrangement to give the final product. [ABSTRACT FROM AUTHOR]

An abstract of the article "Sequential Oxidation/Thermal Induced Intramolecular [2 + 2] Cycloaddition of Propynol-Linylidenecyclopropanes: Access to Novel Cyclobutene-Containing Spiro[2.3]hexenes" by S. Yang and colleagues is presented.

Enantioenriched cyclopropenemethyl ethers or acetates undergo both types of reaction without loss of enantiopurity. [ABSTRACT FROM AUTHOR]

The intramolecular cycloisomerization of a diverse range of substrates using Au(I)-catalysis is presented. [ABSTRACT FROM AUTHOR]

A diagram which shows the carbonylative skeleton rearrangement for 1,4-enynes through rhodium catalyzation is presented.

An abstract of the article "Phosphane- and Amine-Catalyzed Ring-Opening Reactions of Cyclopropenones with Isatin Derivatives: Synthesis of Carboxylaed 1H-Indoles and Multisubstituted 2H-Pyran-2-ones" is presented.

The title reaction is promoted by a bifunctional thiourea-phosphine catalyst derived from an axially chiral binaphthyl scaffold affording spirooxindoles (III) with high enantioselectivities but only moderate diastereoselectivities. [ABSTRACT FROM AUTHOR]

A convenient one-pot two-step protocol allows the conversion of substrate (I) into benzofuran derivatives via 3-(dibromomethyl)-2-arylbenzo[b]furan intermediates. [ABSTRACT FROM AUTHOR]

The title cyclization is accomplished via a tandem Rauhut-Currier/Michael/Rauhut-Currrier reaction sequence to give spirocyclic oxindoles in high yields along with excellent enantio- and diastereoselectivities. [ABSTRACT FROM AUTHOR]

Review: 228 refs. [ABSTRACT FROM AUTHOR]

The novel and highly regioselective title reaction is developed. [ABSTRACT FROM AUTHOR]

Review: ca. 200 refs. [ABSTRACT FROM AUTHOR]

Title cascade reaction provides access towards benzofluorene derivatives (III) and (V) as single diastereomers. [ABSTRACT FROM AUTHOR]

Several intramolecular tandem reactions of methylenecyclopropanes with rhodium(II) azavinyl carbenes are realized. Different types of cycloisomerizations are observed depending on substrates used. Derivatization of the products easily gives a series of diazabicyclo[3.2.1]octane derivatives. [ABSTRACT FROM AUTHOR]

An abstract of the article "Enantioselective Synthesis of Spirooxindole Enols: Regioselective and Asymmetric (3 + 2) Cyclization of 3-Isothiocyanato Oxindoles With Dibenzylidene Ketones" by D. Du, Y. Jiang, Q. Xu, X.-G. Li and M. Shi is presented.

An abstract of the article "Visible-Light-Induced Trifluoromethylation of Isonitrile-Substituted Methylenecyclopropanes: Facile Access to 6-(Trifluoromethyl)-7,8-dihydrobenzo k phenanthridine Derivatives" by X.-B. Hu, Y. Wei and M. Shi is presented.

The article presents chemical equations for an article "Synthesis of 5,6-Dihydropyrazolo[5,1-a]isoquinoline and Ethyl (Z)-3-Acetoxy-3-tosylpent-4-enoate Through Tertiary-amine-Catalyzed [3 + 2] Annulation" by Y. Lei and others, which appeared in 2016 issue of European Journal of Organic Chemistry.

A facile method to synthesize 4-acyloxy-1,2-dihydroquinolines is established through a gold(I)-catalyzed tandem [3,3]-rearrangement and intramolecular hydroamination of propargylic esters, giving the desired products in good yields under mild conditions. [ABSTRACT FROM AUTHOR]

This highly enantioselective synthesis of dihydroisoquinoline derivatives from aromatic sulfonated imines tethered with an alkyne moiety, through a one-pot asymmetric relay catalysis of chiral-phosphine and gold catalysts, is based on an asymmetric aza-Morita-Baylis-Hillman reaction. [ABSTRACT FROM AUTHOR]

An oxidative cyclization of N-alkenyl formamidines leads to the corresponding cyclic formamidinium salts. [ABSTRACT FROM AUTHOR]

An abstract of the article "Palladium-Catalyzed Cascade Cyclization of Allylamine-Tethered Alkylidenecyclopropanes: Facile Access to Iodine/Difluoromethylene- and Perfluoroalkyl-Containing 1-Benzazepine Scaffolds" by Liu-Zhu Yu and colleagues is presented.

Palladium/boron cooperative catalysis enables both the N-CN bond cleavage and the subsequent tautomerization of the amide group allowing for selective oxycyanation of the cyclopropylidene double bond. [ABSTRACT FROM AUTHOR]

Styryl azides (I), (III), (V), (VII) and (IX) undergo Rh-catalyzed intramolecular ring expansion producing a series of indole-fused azetidines (II) and 1H-carbazoles or related derivatives (IV), (VI), (VIII) and (X), resp., in moderate to good yields via a Rh2(III,II) nitrene radical. [ABSTRACT FROM AUTHOR]

The selective formation of either the oxa-bridged-ring system (III) or ring-opened polycyclic indoline derivatives (II) is controlled by using different gold-catalyst systems. [ABSTRACT FROM AUTHOR]

This copper(I)-catalyzed ring-opening-closure/trifluoromethylation cascade proceeds through a radical process. [ABSTRACT FROM AUTHOR]

The newly developed facile procedure allows for the synthesis of 3-substituted isoquinoline and dihydroisoquinoline derivatives which are difficult to access by other known methods. [ABSTRACT FROM AUTHOR]

The Fe-catalyzed cycloisomerization of vinylidenecyclopropanes in the presence of acetyl halide leads to 1,2-disubstituted cyclobutenes such as (II)/(III), (V)/(VI), and (IX)/(X). [ABSTRACT FROM AUTHOR]

The chemical structure for the compound fused pyridine derrivatives is presented including information on the one-pot approach to phenanthridine derivatives using two-step rhodium (I) and gold (I) catalysis.

The article presents chemical equations to Cinchona Alkaloid Thiourea Mediated Asymmetric Mannich Reaction of Isocyanoacetates with Isatin-Derived Ketimines and Subsequent Cyclization by M. Shi and others published in "Royal Society of Chemistry Advances" in 2015.

Control experiments reveal that the oxidation process is probably concerted with the diamination cyclization. [ABSTRACT FROM AUTHOR]

A new selective gold(I)-catalyzed intramolecular heterocyclization of homopropargylic isothiocyanates, erroneously named propargylic thioureas, is developed, efficiently affording two kinds of cycloadducts in moderate to excellent yields with a broad substrate scope. [ABSTRACT FROM AUTHOR]

Title compounds are regioselectively synthesized by this new phosphine-catalyzed [4 + 1] annulation of Morita-Baylis-Hillman carbonates with oxindole-derived α,β-unsaturated imines. [ABSTRACT FROM AUTHOR]

A new NIS-mediated intramolecular diamination and aminosulfuration of alkenes with N-alkyl or N-aryl thioureas is presented. [ABSTRACT FROM AUTHOR]

A diagram is presented which explains the chemical process of Gold- and Silver-Catalyzed Intramolecular Cyclizations of Indolylcyclopropenes for the Divergent Synthesis of Azepinoindoles and Spiroindoline Piperidines.