Nickel-Catalyzed Cyclization of ortho-Iodoketoximes and ortho-Iodoketimines with Alkynes: Synthesis of Highly Substituted Isoquinolines and Isoquinolinium Salts
A convenient method for the synthesis of highly substituted isoquinolines and isoquinolinium salts by the nickel‐catalyzed cyclization of ortho‐haloketoximes and ‐ketimines, respectively, with alkynes is described. The reaction of ortho‐haloketoximes and various alkynes in the presence of [Ni(PPh3)2Br2] and zinc powder in a mixture of acetonitrile and tetrahydrofuran at 80 °C for 15 hours gave 1,3
atom efficient ‘trifluoroacetic ester/ketone metathesis’ has been sincerely witnessed. Enolizable alkyl (at least two non-hydrogen atoms) aryl ketones were found to react readily with ethyl trifluoroacetate under the promotion of NaH to afford trifluoroacetic ester/ketone exchange products, trifluoromethyl ketones (TFMKs), and aromatic acid esters, which were quite different from the general Claisen
[DE] EISEN- ODER KOBALT-KATALYSIERTE KOHLENSTOFF-KOHLENSTOFF-KUPPLUNGSREAKTION VON ARYLEN, ALKENEN UND ALKINEN MIT KUPFERREAGENZIEN<br/>[EN] IRON OR COBALT-CATALYZED CARBON-CARBON COUPLING REACTION OF ARYLS, ALKENES AND ALKINES WITH COPPER REAGENTS<br/>[FR] REACTION DE COUPLAGE CARBONE-CARBONE, CATALYSEES PAR DU FER OU DU COBALT, D'ARYLES, D'ALCENES ET D'ALKINES AVEC DES REACTIFS DE CUIVRE
申请人:UNIV MUENCHEN L MAXIMILIANS
公开号:WO2006040131A1
公开(公告)日:2006-04-20
Die vorliegende Erfindung betrifft ein Verfahren zur Knüpfung von Kohlenstoff-Kohlenstoff-Bindungen ausgehend von einer Kupferverbindung eines Aryls, Heteroaryls, Alkens oder Alkins und einer Aryl-, Heteroaryl-, Alken- oder Alkinverbindung mit einer geeigneten Abgangsgruppe. Die Kupferverbindungen können u.a. durch Transmetallierung aus einer Gignard- oder Lithiumverbindung hergestellt werden. Die Kreuzkupplung dieser Verbindungen mit einer z.B. halogensubstituierten Arylverbindung erfolgt mit Hilfe eines Eisen- oder Kobalt-Katalysators unter Verwendung geeigneter Lösungsmittel und geeigneter Additive.
Iron or Cobalt-Catalyzed Carbon-Carbon Coupling Reaction of Aryls, Alkenes and Alkines With Copper Reagents
申请人:Knochel Paul
公开号:US20080269514A1
公开(公告)日:2008-10-30
The present invention relates to a process for the formation of carbon-carbon bonds starting from a copper compound of an aryl, heteroaryl, alkene or alkine and an aryl, heteroaryl, alkene or alkine compound having a suitable leaving group. The copper compounds can be prepared inter alia by means of transmetalliziation from a Grignard or lithium compound. Cross-coupling of these compounds with e.g. a halogen-substituted aryl compound is carried out by means of an iron or cobalt catalyst using suitable solvents and suitable additives.
Herein, we report a straightforward method to access alkenyl dihydrofurans via palladium-catalyzed acetalization/annulation from conjugated enynones and alcohols. The reaction undergoes a 5-exo-dig cyclization process, with the formation of four new chemical bonds including two carbon–halogen bonds on the exocyclic alkenyl moiety. Preliminary mechanistic studies suggest that the haloalkyne generated