Annulation Of Internal Alkynes Research Articles

ChemInform Abstract: Palladium‐Catalyzed Annulation of Internal Alkynes: Direct Access to π‐Conjugated Ullazines.

AbstractThe Pd‐catalyzed direct C—H cyclization of dibromoarylpyrroles with various diarylalkynes produces the title ullazines in good yields.

Palladium-Catalyzed Annulation of Internal Alkynes to Ullazines

Palladium-Catalyzed Annulation of Internal Alkynes to Ullazines

ChemInform Abstract: Palladium‐Catalyzed Annulation of Internal Alkynes in Aqueous Medium.

AbstractIt is demonstrated, that a reusable palladacycle efficiently catalyzes the carbo‐ and heteroannulation of internal alkynes with a wide variety of functionalized aryl halides in aqueous media.

ChemInform Abstract: Palladium‐Catalyzed Regioselective [3 + 2] Annulation of Internal Alkynes and Iodopyranoquinolines with Concomitant Ring Opening.

AbstractUnsymmetrical internal alkynes such as (X) or (XII) generate selectively a single isomers [cf.(XI) or (XIII)].

Palladium-Catalyzed Regioselective [3 + 2] Annulation of Internal Alkynes and Iodo-pyranoquinolines with Concomitant Ring Opening

A regioselective tandem synthesis of highly functionalized pyrrolo[1,2-a]quinolines has been developed through a novel strategy by palladium-catalyzed [3 + 2] annulation of iodo-pyranoquinolines and internal alkynes with subsequent ring opening. Pyranoquinoline with n-alkyl substitution at the 3-position leads to the formation of pyrrolo-acridones via [3 + 2] annulations/ring opening and successive intramolecular cross-aldol condensation.

Synthesis of Cyclopentacarbazolones via Palladium-Catalyzed Annulation of Internal Alkynes

Synthesis of Cyclopentacarbazolones via Palladium-Catalyzed Annulation of Internal Alkynes

ChemInform Abstract: Facile Synthesis of Indenones by Cyclopalladated Ferrocenylimine‐Catalyzed Annulation of Internal Alkynes.

AbstractThe method is applicable to several o‐halobenzaldehydes (I) and symmetrical internal alkynes.

Facile synthesis of indenones by cyclopalladated ferrocenylimine‐catalyzed annulation of internal alkynes

AbstractAn efficient and facile protocol for the annulation of o‐halobenzaldehyde derivatives with diverse internal alkynes has been developed using cyclopalladated ferrocenylimine as the catalyst, and the indenones as the products could be obtained in moderate to good yields. It was found for the first time that the addition of benzoic acid could remarkably speed up the reaction process. Copyright © 2011 John Wiley & Sons, Ltd.

ChemInform Abstract: Synthesis of Isoindolo[2,1-a]indoles by the Palladium-Catalyzed Annulation of Internal Alkynes.

ChemInform Abstract: Synthesis of Isoindolo[2,1-a]indoles by the Palladium-Catalyzed Annulation of Internal Alkynes.

ChemInform Abstract: Annulation of Internal Alkynes Through a Hydroamination/Aza‐Heck Reaction Sequence for the Regioselective Synthesis of Indoles.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Annulation of internal alkynes through a hydroamination/aza-Heck reaction sequence for the regioselective synthesis of indoles

Highly regioselective annulation reactions of unsymmetrically substituted alkynes by primary 2-bromo or 2-chloroanilines are achieved with an efficient one-pot protocol, which relies on a regioselective TiCl 4-catalyzed intermolecular hydroamination and a subsequent palladium-catalyzed intramolecular aza-Heck reaction. The use of unsymmetrically substituted alkynes in this strategy enables the synthesis of diversely functionalized indoles, with a regioselectivity that is complementary to the one obtained when employing Larock's annulation reaction.

A Facile Synthesis of Various Fluorine‐Containing Indole Derivatives via Palladium‐Catalyzed Annulation of Internal Alkynes.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Synthesis of Substituted Naphthalenes and Carbazoles by the Palladium‐Catalyzed Annulation of Internal Alkynes.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Synthesis of Substituted Naphthalenes by the Palladium‐Catalyzed Annulation of Internal Alkynes.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Synthesis of isoindolo[2,1-alpha]indoles by the palladium-catalyzed annulation of internal acetylenes.

A wide variety of substituted isoindolo[2,1-alpha]indoles have been prepared via annulation of internal alkynes by imines derived from o-iodoanilines in the presence of a palladium catalyst. This methodology provides an extremely efficient route for the synthesis of these tetracyclic heterocycles from readily available starting materials. The mechanism of this interesting annulation process appears to involve (1) oxidative addition of the aryl iodide to Pd(0), (2) alkyne insertion, (3) addition of the resulting vinylic palladium intermediate to the C-N double bond of the imine, (4) either electrophilic palladation of the resulting sigma-palladium intermediate onto the adjacent aromatic ring derived from the internal alkyne or oxidative addition of the neighboring aryl carbon-hydrogen bond, and (5) reduction of the tetracyclic product and Pd(0). A variety of internal acetylenes have been employed in this annulation process in which the aromatic ring of the alkyne contains either a phenyl or a heterocyclic ring.

ChemInform Abstract: Synthesis of 2,3‐Disubstituted Indoles via Palladium‐Catalyzed Annulation of Internal Alkynes.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform Abstract: Synthesis of α‐Pyrones via Palladium‐Catalyzed Annulation of Internal Alkynes.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform Abstract: Palladium‐Catalyzed Annulation of Internal Alkynes by Arene‐Containing Vinylic Iodides and Triflates.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform Abstract: Synthesis of Aromatic Heterocycles via Palladium‐Catalyzed Annulation of Internal Alkynes.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.